Yeah cept the UK PSN store will not accept some American credit cards.
The only other workaround that is to buy prepaid UK PSN store cards off ebay which is a real hassle :/
I canceled my order of Little Big Planet from gogamer
I found out that NONE of the DLC that you download from the playstation network store will work on the PAL/International version :/
I was really looking forward to LBP too :(
*EDIT*
I meant to say that the DLC you download from the US PSN...