i just cant follow your post tamsaddle the numbers that you have tattoed on there ears should be the same as the pedigree certificate if you have registered them
your sow gives birth to 12 piglets 10 survive and 2 are victims of birth on your birth notification you write 12 born 10 notified the five boys get (for arguments sake) 1-5 the girls get 6-10
boy 3 and girl 6 8 10 are cracking pigs meet all the standards of the Tamworth pig so you register them with your prefix and there birth number (this is a rolling number your next litter starts from 11 and ends with whatever)
now the bpa have maybe corrected your mistake if you made one on the rolling number also maybe corrected if you are using only registered piglets on the rolling number basis
i know a lot of mistakes are made and corrected by Diane (very efficient and helpfull)
it is simple to follow but do come back if you are still in need of assistance