Looks like I had deleted the ATC map as well, I had three of them sitting in the recycle bin including one which was deleted yesterday and I didn't get any warnings about duplicates when I restored it. Too keen lol.
Everything is sweet now, red lines and no errors, thank you very much, we can colour this one solved
So for future people who have the same issue and find this thread - move the files mentioned in Steve's post above to somewhere safe, start fsbuild which will throw up lots of errors, rebuild the databases, restart fsbuild and all should be fine unless you got rid of extra files, which is why you move not delete them. Once everything is solved then you can delete them.
Gary