Ive both, and the application proscess are the oposite to each other.
With a shotgun, the police need good reason on THEIR part, why you are not fit to have one,with a "FAC" YOU have to have good reason AND the land to shoot over.If you have the land and the owner is willing to be nominated on your FAC then that is a start.But this is where it can start getting tricky (depending on which liscensing area you come under) for example i know somebody who didnt have any basic knowledge of firearms have a condition put on his FAC (when it was finaly granted) that he could only shoot with somebody else who had on the land nominated, for him it wasnt a problem, but it could be.
IF you have any problems like this then my advise would be to get an FAC air rifle to start then at a later date put in a variation for a 22 and soforth.