Location filming... how much money should they pay?

I just spoke to the guy again and he's saying they'll have their own generators out in the street but may possibly have one small light plugged in inside. He said they'd pay £100 per hour they're here, which i guess is pretty reasonable going by the per day figures others have mentioned. It also means they can't pay for 2 hours then film for 5 without paying.
Does this sound reasonable?

Thats a decent price just make sure they have public indemnity insurance, insurance against accidental damage, and get/check their policy details before you agree or let them into your place, cos if they break anything you need to be sure they are covered.