I don't do any. I have given money for years. It solves a lot of problems. I don't have to rack my brains trying to think of something they haven't got and they buy something they really want instead of having to stand in the queue in M & S to exchange the stupid present I have bought them for something more appropriate. Works for me.
I don't bother I just give Trish the car keys and the card and send her off down town with my sister. It's amazing that despite saying, every year for the last five years, we're only buying for the little ones she always comes back with a car full of stuff, which takes some doing when you've got an estate car.