Permalinks on blog modules taking me to 404 error

Check your permalink settings. It appears you have an extra apostrophe in there.

See https://i.imgur.com/pKke369.png

Should it have the apostrophe at the end too?

No, there should be no apostrophe at all.

Thanks have changed it think it’s possibly due to a plugin – Divi extras as the formatting on my blog page has now vanished

Divi and that plugin are both commercial products

Commercial products are not supported in these forums. .

Fortunately, Divi should have their own customer support system you can contact for help on this issue, which I highly recommend you do, so you can explore with them if Divi (either the theme or plugin) has anything to do with your issue and get it solved if so, or rule that out.

Thanks I’ll explore what’s causing it now I know what the problem was with the apostrophes.