No good sending benefit cheats to jail, that's not the answer. For one it will cost a lot more to keep someone behind bars than for them to claim benefits. It may act as a deterrent to some but the majority won't care and if they do get sent down, they'll probably end up as hardened criminals by the time they get out anyway.
The root of the problem needs to be looked at. What is the incentive to work for most? er...minimum wageNo wonder people claim benefits and get a job on the side because by the time tax, N.I & the cost of accomodation gets deducted they're left with next to nothing and a lot worse off.