> Unless you have a real need to keep going for hours (which you will find expensive
I don't want to pay more than £500, and it's crystal ball gazing anyway as to how long a power cut is going to last, as it might simply need us to pull our finger out and get the generator on. Crystal-ball gazing is difficult because we don't get power cuts that often, so don't have enough experience. I don't have anything to monitor shutdown, such PCs have their own separate APC UPSs for that, not under consideration here. This is just about keeping modems alive to keep away the wrath of the DLM Gods and then keeping the LAN and Internet up, for convenience.
I wonder if I would get more value-for-money (more J/£) from eBay. Sounds like a recipe for frustration and knackered batteries.
So I suppose I'm most interest in what I can get that is fairly expensive and gives lots of C (ie A h) can't help sticking to the SI units.