Let me get this straight-- you spend less than 100Pounds per month (I figure around 800 kwh), and that gets you pinched?
If I estimated correctly, that is close to the AVERAGE residential electical consumption in New England, USA.
At least one of the following must be true:
1) Your electricity comes much cheaper than I estimated
2) Americans are pigs, consuming quantities of electricity way beyond folks accross the pond (you'd blend just fine here)
3) Brits live in a virtual police state because the power company can trump up an excuse for a police search (not that diff from the US, actually)
4) Brits live in a virtual police state because police need no real reason to search a private home
I can't wait to find out what's true!