Hello, and congratulations in advance on getting your first pigs !
Yes, you will need a herd number. Contact your local Animal Health office and they'll send one out to you - or may even give it over the phone, as some do. You will need this number whenever you move your pigs - e.g. to an abattoir or another farm.
The herd number will also need to be on any tags you put in the pigs. When you order your tags (message me if you want details of suppliers), you will be asked for this number. If you decide to slap-mark instead of tagging (I don't, because I find tagging very straightforward), you will need to order a slap-marker kit with characters whcih make up your herd number.
As you are planning to send some for slaughter, you will have to register for online movements. See eaml2.org.uk (no wwws) for details. There's a step-by-step guide to setting up a movement, when the time comes - or give me a ring and I'll talk you through it.
re. registration etc, I'm a bit confused about what your plans are. Do you really want to buy registered breeding stock at this stage? Why not get used to pig keeping first, give it a try for four months, send the finished pigs to slaughter, and then decide whether you want to do it again? If the pigs are registered pedigree large blacks, they should be notched. Contact the LB Pig Breeders' Club for more info
http://www.largeblackpigs.co.uk or email the secretary,
jwood@largeblackpigs.co.uk If you do decide to buy registered pedigree stock, the breeder will do the paperwork for the registration and, if he or she notifies the BPA straightway, you should get confirmation through the post within a week. However, I would urge you to take your time. Get some weaners, enjoy rearing them and learn about their needs. Then, when the time is right, consider buying breeding stock - it's a huge jump to make!
All the very best
Liz