Talk about Christmas Cold Turkey! Finagle's Law strikes again so, just when I'd be settling in to doing a bit of surfing over the holiday period to pass the time, I couldn't. Even buying a replacement wouldn't be simple - no internet to check prices, models, etc. and, it being the holiday period, no guarantee of quick delivery.
We were planning to go away for a few days over the weekend and the new year so it wasn't a huge deal but it is very, very unsettling to have no connection to the net. Anyway, I'm back online again now. The problem was the the power supply, which was easily replaced.