diff --git a/cypress/e2e/catalogue/catalogueCategory.cy.ts b/cypress/e2e/catalogue/catalogueCategory.cy.ts
index 52b2adf06..b2fed902b 100644
--- a/cypress/e2e/catalogue/catalogueCategory.cy.ts
+++ b/cypress/e2e/catalogue/catalogueCategory.cy.ts
@@ -275,15 +275,10 @@ describe('Catalogue Category', () => {
   });
 
   it('when root has no data it displays no catagories error message', () => {
-    cy.window().then(async (window) => {
-      // Reference global instances set in "src/mocks/browser.js".
-
-      const { worker, rest } = window.msw;
-      worker.use(
-        rest.get('/v1/catalogue-categories/', (req, res, ctx) => {
-          return res(ctx.status(200), ctx.json([]));
-        })
-      );
+    cy.editEndpointResponse({
+      url: '/v1/catalogue-categories/',
+      data: [],
+      statusCode: 200,
     });
     cy.findByText(
       'There are no catalogue categories. Please add a category using the plus icon in the top left of your screen'
diff --git a/cypress/e2e/catalogue/catalogueItems.cy.ts b/cypress/e2e/catalogue/catalogueItems.cy.ts
index 84528accb..1f3b11281 100644
--- a/cypress/e2e/catalogue/catalogueItems.cy.ts
+++ b/cypress/e2e/catalogue/catalogueItems.cy.ts
@@ -118,13 +118,13 @@ describe('Catalogue Items', () => {
     cy.findByRole('button', { name: 'Save' }).click();
 
     cy.findByText(
-      'Please enter a valid Manufacturer URL. Only "http://" and "https://" links are accepted'
+      'Please enter a valid Manufacturer URL. Only "http://" and "https://" links with typical top-level domain are accepted'
     ).should('exist');
     cy.findByLabelText('Manufacturer URL *').clear();
     cy.findByLabelText('Manufacturer URL *').type('https://test.co.uk');
 
     cy.findByText(
-      'Please enter a valid Manufacturer URL. Only "http://" and "https://" links are accepted'
+      'Please enter a valid Manufacturer URL. Only "http://" and "https://" links with typical top-level domain are accepted'
     ).should('not.exist');
   });
 
diff --git a/cypress/support/commands.ts b/cypress/support/commands.ts
index cba8d3ceb..e7d950bb5 100644
--- a/cypress/support/commands.ts
+++ b/cypress/support/commands.ts
@@ -43,6 +43,18 @@ Cypress.Commands.add('clearMocks', () => {
   mockedRequests = [];
 });
 
+Cypress.Commands.add('editEndpointResponse', ({ url, data, statusCode }) => {
+  cy.window().then((window) => {
+    const { worker, rest } = window.msw;
+
+    worker.use(
+      rest.get(url, (req, res, ctx) => {
+        return res(ctx.status(statusCode), ctx.json(data));
+      })
+    );
+  });
+});
+
 Cypress.Commands.add('startSnoopingBrowserMockedRequest', () => {
   cy.window().then((window) => {
     const worker = window?.msw?.worker;
@@ -91,12 +103,12 @@ declare global {
        * Clear all mocks
        * @example cy.clearMocks()
        */
-      clearMocks(): Chainable<JQuery<HTMLElement>>
+      clearMocks(): Chainable<JQuery<HTMLElement>>;
       /**
        * Use before findBrowserMockedRequests for checking specific requests were sent
        * @example cy.startSnoopingBrowserMockedRequest()
        */
-      startSnoopingBrowserMockedRequest(): Chainable<JQuery<HTMLElement>>
+      startSnoopingBrowserMockedRequest(): Chainable<JQuery<HTMLElement>>;
       /**
        * Returns a request that was recorded after 'startSnoopingBrowserMockedRequest' was called
        * 
@@ -113,7 +125,17 @@ declare global {
                     );
                   });
        */
-      findBrowserMockedRequests({method, url}: any): Chainable<unknown>
+      editEndpointResponse({ url, data, statusCode }: any): Chainable<unknown>;
+      /**
+       * Edits the response of the endpoint request 
+       * 
+       * @example  cy.editEndpointResponse({
+                    url: '/v1/catalogue-categories/',
+                    data: [],
+                    statusCode: 200,
+                   });
+       */
+      findBrowserMockedRequests({ method, url }: any): Chainable<unknown>;
     }
   }
 }
diff --git a/src/api/catalogueItem.tsx b/src/api/catalogueItem.tsx
index 1de5c890f..932117d04 100644
--- a/src/api/catalogueItem.tsx
+++ b/src/api/catalogueItem.tsx
@@ -151,6 +151,7 @@ export const useDeleteCatalogueItem = (): UseMutationResult<
       },
       onSuccess: () => {
         queryClient.invalidateQueries({ queryKey: ['CatalogueItems'] });
+        queryClient.removeQueries({ queryKey: ['CatalogueItem'] });
       },
     }
   );
diff --git a/src/catalogue/items/catalogueItemsDialog.component.test.tsx b/src/catalogue/items/catalogueItemsDialog.component.test.tsx
index 8880480a2..47e61083f 100644
--- a/src/catalogue/items/catalogueItemsDialog.component.test.tsx
+++ b/src/catalogue/items/catalogueItemsDialog.component.test.tsx
@@ -254,7 +254,7 @@ describe('Catalogue Items Dialog', () => {
 
     expect(
       screen.getByText(
-        'Please enter a valid Manufacturer URL. Only "http://" and "https://" links are accepted'
+        'Please enter a valid Manufacturer URL. Only "http://" and "https://" links with typical top-level domain are accepted'
       )
     ).toBeInTheDocument();
 
@@ -349,7 +349,7 @@ describe('Catalogue Items Dialog', () => {
       expect(onClose).toHaveBeenCalled();
     });
 
-    it('display error message when invalid number format', async () => {
+    it('display error message when invalid number format in property values and invalid manufacturer url', async () => {
       props = {
         ...props,
         parentId: '4',
@@ -399,7 +399,7 @@ describe('Catalogue Items Dialog', () => {
 
       expect(
         screen.getByText(
-          'Please enter a valid Manufacturer URL. Only "http://" and "https://" links are accepted'
+          'Please enter a valid Manufacturer URL. Only "http://" and "https://" links with typical top-level domain are accepted'
         )
       ).toBeInTheDocument();
     });
@@ -724,7 +724,7 @@ describe('Catalogue Items Dialog', () => {
       );
     });
 
-    it('displays error message if no form fields have been changed', async () => {
+    it('displays error message if no fields have been changed (when they are no catalogue property fields)', async () => {
       props = {
         ...props,
         parentId: '1',
diff --git a/src/catalogue/items/catalogueItemsDialog.component.tsx b/src/catalogue/items/catalogueItemsDialog.component.tsx
index 3ec08b509..55048a9a6 100644
--- a/src/catalogue/items/catalogueItemsDialog.component.tsx
+++ b/src/catalogue/items/catalogueItemsDialog.component.tsx
@@ -58,7 +58,10 @@ export interface CatalogueItemsDialogProps {
 function isValidUrl(url: string) {
   try {
     const parsedUrl = new URL(url);
-    return parsedUrl.protocol === 'http:' || parsedUrl.protocol === 'https:';
+    return (
+      (parsedUrl.protocol === 'http:' || parsedUrl.protocol === 'https:') &&
+      parsedUrl.hostname.includes('.') // Checks for the typical top-level domain
+    );
   } catch (error) {
     return false;
   }
@@ -213,7 +216,7 @@ function CatalogueItemsDialog(props: CatalogueItemsDialogProps) {
       setManufacturerWebUrlErrorMessage(
         !catalogueItemManufacturer.web_url.trim()
           ? 'Please enter a Manufacturer URL'
-          : 'Please enter a valid Manufacturer URL. Only "http://" and "https://" links are accepted'
+          : 'Please enter a valid Manufacturer URL. Only "http://" and "https://" links with typical top-level domain are accepted'
       );
       hasErrors = true;
     }
@@ -354,7 +357,7 @@ function CatalogueItemsDialog(props: CatalogueItemsDialogProps) {
         setManufacturerWebUrlErrorMessage(
           !catalogueItemManufacturer.web_url.trim()
             ? 'Please enter a Manufacturer URL'
-            : 'Please enter a valid Manufacturer URL. Only "http://" and "https://" links are accepted'
+            : 'Please enter a valid Manufacturer URL. Only "http://" and "https://" links with typical top-level domain are accepted'
         );
         hasErrors = true;
       }
diff --git a/src/catalogue/items/catalogueItemsLandingPage.component.test.tsx b/src/catalogue/items/catalogueItemsLandingPage.component.test.tsx
index 886eed5e0..20a06e93c 100644
--- a/src/catalogue/items/catalogueItemsLandingPage.component.test.tsx
+++ b/src/catalogue/items/catalogueItemsLandingPage.component.test.tsx
@@ -73,6 +73,14 @@ describe('Catalogue Items Landing Page', () => {
       ).toBeInTheDocument();
     });
   });
+
+  it('shows the loading indicator', async () => {
+    createView('/inventory-management-system/catalogue/items/1');
+
+    await waitFor(() => {
+      expect(screen.getByRole('progressbar')).toBeInTheDocument();
+    });
+  });
   it('toggles the manufacturer so it is either visible or hidden', async () => {
     createView('/inventory-management-system/catalogue/items/1');
     await waitFor(() => {
@@ -95,7 +103,7 @@ describe('Catalogue Items Landing Page', () => {
     });
   });
 
-  it('opens the edit catalogue item dialog', async () => {
+  it('opens and closes the edit catalogue item dialog', async () => {
     createView('/inventory-management-system/catalogue/items/1');
 
     await waitFor(() => {
diff --git a/src/catalogue/items/catalogueItemsLandingPage.component.tsx b/src/catalogue/items/catalogueItemsLandingPage.component.tsx
index cd665a240..6768fb7e4 100644
--- a/src/catalogue/items/catalogueItemsLandingPage.component.tsx
+++ b/src/catalogue/items/catalogueItemsLandingPage.component.tsx
@@ -7,7 +7,13 @@ import ListItem from '@mui/material/ListItem';
 import ListItemText from '@mui/material/ListItemText';
 import ExpandMoreIcon from '@mui/icons-material/ExpandMore';
 import ExpandLessIcon from '@mui/icons-material/ExpandLess';
-import { Box, Button, Collapse, Link as MuiLink } from '@mui/material';
+import {
+  Box,
+  Button,
+  Collapse,
+  LinearProgress,
+  Link as MuiLink,
+} from '@mui/material';
 import { useCatalogueCategoryById } from '../../api/catalogueCategory';
 import CatalogueItemsDialog from './catalogueItemsDialog.component';
 import {
@@ -257,19 +263,25 @@ function CatalogueItemsLandingPage() {
           </Box>
         </Grid>
       )}
-      {!catalogueItemIdData && !catalogueItemIdDataLoading && (
-        <Box
-          sx={{
-            width: '100%',
-            justifyContent: 'center',
-            marginTop: '8px',
-          }}
-        >
-          <Typography sx={{ fontWeight: 'bold' }}>No result found</Typography>
-          <Typography>
-            This item doesn't exist. Please click the Home button to navigate to
-            the catalogue home
-          </Typography>
+      {!catalogueItemIdDataLoading ? (
+        !catalogueItemIdData && (
+          <Box
+            sx={{
+              width: '100%',
+              justifyContent: 'center',
+              marginTop: '8px',
+            }}
+          >
+            <Typography sx={{ fontWeight: 'bold' }}>No result found</Typography>
+            <Typography>
+              This item doesn't exist. Please click the Home button to navigate
+              to the catalogue home
+            </Typography>
+          </Box>
+        )
+      ) : (
+        <Box sx={{ width: '100%' }}>
+          <LinearProgress />
         </Box>
       )}
 
diff --git a/src/catalogue/items/catalogueItemsTable.component.test.tsx b/src/catalogue/items/catalogueItemsTable.component.test.tsx
index 914b68f6c..b51aecfc9 100644
--- a/src/catalogue/items/catalogueItemsTable.component.test.tsx
+++ b/src/catalogue/items/catalogueItemsTable.component.test.tsx
@@ -122,7 +122,7 @@ describe('Catalogue Items Table', () => {
     });
   });
 
-  it('opens the delete catalogue item dialog', async () => {
+  it('opens the delete catalogue item dialog and can delete an item', async () => {
     createView();
 
     await waitFor(() => {
@@ -136,6 +136,7 @@ describe('Catalogue Items Table', () => {
     const deleteButton = screen.getByRole('button', {
       name: 'Delete Energy Meters 26 catalogue item',
     });
+
     await user.click(deleteButton);
 
     await waitFor(() => {
diff --git a/src/index.tsx b/src/index.tsx
index d7cca1586..8945a8334 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -174,12 +174,25 @@ function prepare() {
 }
 
 const settings = fetchSettings();
+
 setSettings(settings);
 
 if (
-  process.env.NODE_ENV === 'development' ||
-  process.env.REACT_APP_E2E_TESTING
+  process.env.NODE_ENV === 'development' &&
+  !process.env.REACT_APP_E2E_TESTING
 ) {
+  settings
+    .then((settings) => {
+      if (settings && settings.apiUrl !== '') {
+        render();
+      } else {
+        prepare().then(() => render());
+      }
+    })
+    .catch((error) => log.error(`Got error: ${error.message}`));
+
+  log.setDefaultLevel(log.levels.DEBUG);
+} else if (process.env.REACT_APP_E2E_TESTING) {
   prepare().then(() => render());
   log.setDefaultLevel(log.levels.DEBUG);
 } else {
diff --git a/src/mocks/handlers.ts b/src/mocks/handlers.ts
index 3e5fc49aa..f11ccafb2 100644
--- a/src/mocks/handlers.ts
+++ b/src/mocks/handlers.ts
@@ -131,7 +131,7 @@ export const handlers = [
           })
         );
       } else {
-        return res(ctx.status(200), ctx.json(''));
+        return res(ctx.status(204));
       }
     } else {
       return res(ctx.status(400), ctx.json(''));
@@ -191,7 +191,7 @@ export const handlers = [
           })
         );
       } else {
-        return res(ctx.status(200), ctx.json(''));
+        return res(ctx.status(204));
       }
     } else {
       return res(ctx.status(400), ctx.json(''));