In the UK there is an actual jump pilot certificate which is issued by the British Parachute Association. It is not an officialy recognised 'rating' as per the CAA, as the BPA are pretty much self regulated. The training required is generally based on 5 hours of flying which will include familiarisation of the aircraft involved, followed by instruction on things such as 'run in's', static line jumps, tandems, emergenies etc. There is a also a fairly straight forward written test which will cover most aspects of jump piloting. Once you've completed the relevant training then thats you good to go.
Most clubs will prefer some reasonable experience in terms of hours and will also prefer some kind of instrument qualification such as an IMC rating. You will probably be expected to pay for your own training too in terms of aircraft hire until you get your rating. Have a look at the British Parachute Association website for more info.