Thanks Neil. The last post in UK Engines was lost. There is no way to get it back. I've looked and can not determine who was the last visitor (they didn't login before posting and the error occured when they left the post).
Sorry Brett and all UKers - I confess. It was my 'friendly' poltergeist. I have a mains circuit breaker that trips over itself for no discoverable reason - it went just as I had posted (not even anything important) When I fired up again and got back to the forums (or tried) - none of them were there, the whole of WWW seemed to be down - so I hoped it wasn't me.
It won't happen again. Sod's law - I had bought a UPS for that computer but hadn't got round to grovelling in medusa's hairstyle. It's plugged in now :)