On an American show on Food Network on Sky Diners, Drive ins and Dives they often have pulled pork. They often use pork shoulder as well as the pork butt - I think it's maybe the park that we use for making a gammon joint. The secret is in the rub they use and a long slow cooking time. If it helps this show is on at 10.00 in the evening and barely an episode goes by without some pulled pork