Citroen C4 reprograming

Hi there can anybody help.
I have just bought a remote key fob for my new C4 SX and do not want to pay my local dealership £35.00 for the reprogramming.
Does anyone know how this is done is there a list of thing to do to ignition etc or am I going to have to pay the money.
Mark, Shropshire, UK

I found the method on the net but cant remember where.but I think it is also in the handbook.