anyone any ideas were the cheapest place is to get a iphone screen replaced thanks x

Which one is it ?

3G you're looking around £20 or less

4 or 4s £45 or less depending which one it is.

Don't buy (or go to anywhere that use) cheap import digitizers, they're not worth the money, and they don't fit property, by design.

just the 3g i fort it would be so dear xx

They're not that expensive, we do them all day