My costs in late October for 'Kill and Split' were £22 per pig in a 85 -100 kilogram size from Joseph Morris in South Kilworth, Leicstershire. Kill and split means exactly that; killed and split down the middle with one side still retaining the head with the pluck returned in a plastic bag.
Regards, Dave
P.S. I am fortunate in having a drinking pal in the village who was a butcher.