We didn't buy them - they were born here! We have sold their female siblings and been left with the boys.
We haven't wormed them no. That is something I was going to do, and is actually how I found this forum looking for the best way. Pretty sure they don't have them though. Have had a friend over that keeps loads of pigs and he's pretty sure too. In fact he said there's nothing wrong with their size for their age - think I'm comparing unfavourably with our last litter which was very small and so spoiled rotten - the weaners were already 21kg when leaving their mother at 8-9 weeks!!!
I use Verm - X to prevent the worms and since no pigs have been kept here before and none have had worms then theoretically there can't be any here for them to pick up!
Rosemary I am totally with you - that is how I've always fed them too and am glad someone agrees! We used to make three piles too for our three females and the same thing happened where eventually they settled on a pile each!
For the boys I have been putting a large pile on the ground and they have just gathered in a circle around it - and like you say they are very thorough at finding and eating it all (when it's rolls) - I did notice the pellets getting trodden in though.
I got a six foot trough so there are six spaces so am using a small hook on one as well - but it means one little fella has to realise he has no space and work out what to do about it! Bless

Am still using the rolls for the girls - they get it in their straw in their shed - but when it gets really warm and dry in their outdoor bit I'll be back to putting it outdoors for them too.