Hi Gareth , you will need to firstly a CPH (county parish holding number) , this will be needed for all movement paperwork. also you will need a herd number for your piggies , get hold of DEFRA to sort this for you. a good tip is to attend a pig keeping course - these are done by many people these days i attended one at "pig paradise" run by Tony York - very knowledgable , very passionate and very funny. covers all aspects of pig keeping (and you get a great lunch!!)
the other things you will need sre a great sense of humour , lots of dry clothes and , in my experience , a sharp mind to to devise more and more cunning fences!!!!!