Do you know anyone who's an experienced pig keeper who could go with you to see these people, they'll know what to ask for? You're in lincolnshire?? There must be somebody nearish that could help you with this.
If you can't get anyone to go with you this is the info you need. They by rights should fill in the AML but you could do it together.
1. CPH number
2. name, address, telephone number pref landline
3. number of pigs collecting, if they are not tagged you need their herd number, (or if you can the herd number of the people they bought the pigs from, the original paperwork they got them on may have this info if they can find it)) and you can make a number up for them to add on the end eg
AB3456/51 & 52 (part in red is eg of herd no) you can get some tags if you wish when you get home. We have a cross bred sow that visits us and all her tag says is her herd number so it can be done.
4 you will be the transporter & destination so thats yours to fill in.
See what you can gather amd take it from there.
HTH
Mandy