fuel costs
Actually, it's even cheaper.
The fuel costs at £70 is an underestimate. Fill up the tank, pay the bill, and fly for an hour and then fill up again. Your bill will be more than 70 quid, I am sure of that. £80 per hour is more realistic, since fuel is burnt on, errr, engine time, not stick time.
I've had my say about commercial rates for a 44 on another thread, but to summarise, it's about £250.00 DRY, plus insurance, plus unscheduled maintenance, plus payment up front, plus minimum usage clause.
So someone will end up paying the cost of renting out at £250 wet, even if it is not the hirer in this case.
Big Ls.