Restarted my router and it has not come back online properly, had to do a factory reset... Good job my every day carry includes a paperclip as it was just the tool for the job. Some things kept working even though it was broken because they had their own dns cache, but when I did the factory reset of the router to get things working again, I had changed the name and password so everything that was connected (including Clare doing the shopping) stopped working, and so I'm in trouble AGAIN.
All fixed again now.