As Brian put it in a comment, the decorators have been visiting.
Do not decide to play around with templates late at night after a couple of glasses of Colombard's finest Chardonnay.
Thankfully when switching to the new way of publishing your blog, the old template is saved, sort of. This morning I realised it was in a bit of a mess. I did not like the new style of blog editing, well actually, I did not understand it. But I did want a new look, so I stuck with the old method and just changed the template. Mistake. Nearly all editing had been lost.
Right, bite the bullet. Change to the new system and learn how it works. I did. One area caused me great stress. It would not do what it says it will do. A look at the knowledge base cleared that one. Remove the 2 in the web url that may be there. It was, I removed it and all worked.
It will take some playing to get all running again. If I have left you off my blog list, it was probably deliberate. Just kidding. I will get it right soon enough. If you are not keen on the way your name is displayed or the heading you are under, let me know via email.