Dont think this has been listed already but here it is.
Basically Paddy Power will give you £3 credit to play in their bingo rooms if you sign up an account with them.
There is no deposit required to play the game so you're not losing anything, and if you win then it makes the freebie even better.
Get £3 free bingo money when you open an account,
no deposit required. One account per customer.