Well, that was odd.

Main desktop has been showing the copy of  the blog on it’s new host since this morning. Laptop, was still seeing the old one, which Helen has just posted too - all sorted now though

Reason was (I think) that they were using different name servers, I run Treewalk DNS on the main pc as our local server (from the days when the then ISP had dodgy DNS), but the laptop seemed to have lost the setting and was just using the automatic setting - the routers I think