Many, many thanks to Peter and this website.
I had the same problem just over a week ago and was already researching replacement PVRs when it occurred to me to Google the issue. This website and strand came up, so like others I ordered a new power supply. It arrived today. I've just attached it and, hey presto, normal service is resumed, including the 68 hours of programmes I thought I'd lost. (Just need to find 68 hours to watch them all, now!!!)
Grateful doesn't go close to covering my feelings.
Once again, many thanks.
Mark
Mark Craig, September 2010