I bought something called 'Old Bay' seasoning which you can only get in the USA and it added a really nice flavour having not used it before but it is not something you have to use.
Bone in pork shoulder
Old Bay Seasoning
Mustard Powder (Coleman's)
Crushed Chipotle chillis
Fresh ground black pepper
Here's the Old Bay seasoning I used as part of my dry rub.
First I covered my pork shoulder in the dry rub and I know it's not traditional but I then smothered it in a really good BBQ sauce before covering in clingfilm and leaving to marinade in the fridge over night.
I cooked my pulled pork for nearly eight hours the next day on a really low heat in the bottom of the oven.
It literally fell off the bone and was so tender, I put some little yellow peppers in about halfway through cooking and they were a really tasty addition.
I served my pulled pork with macaroni cheese, jacket potatoes, coleslaw, salad and lot's of BBQ sauce.
I can't recommend doing this to a shoulder of pork enough, quick do it!!!