You might not have been able to see those link/ adverts, I can’t see them now. Turns out is was malware on my computer, not on the blog itself. Apparently the free version of Avira antivirus doesn’t protect against malware. It does a sterling, and I repeat, free job on viruses, as the name suggests, but you either have to pay for the pro or get other malware protection.
Anyway, all sorted now. I think. You can stand down from blog defcon one.