Hello and Welcome Diane from Ireland
Wow thats a lot of questions.
I do not know the situation in the UK, but I am a pig breeder, and due to the Swine Flu epidemic there are restrictions in place.
One thing we cannot do is give anyone pigs wh has not got the specific pig herd number already.
I would assume also, that any pig has to be tagged, as the reason for tagging and recording these animals is part of disease control, and not just an agricultural requirement - so even though you may class them as pets, there still pigs and therefore have to comply with pig movement documents, herd numbers and the like.
As I say, I am in Ireland so its different here - I would ring DEFRA and ask for your holding or herd number, and read up on their web site for information on keeping and owning pigs.
Good luck and welcome again to the forum
Julie