I think that's a no no mate, I'd happily deal with the waste myself but I think as they are all tagged and therefore registered with defra I need to be able to prove where they have gone, and back it up with a paper trail if needs be? So if I did say that they were slaughtered at home, I'd need to prove the waste was disposed of properly.
If it was just one I suppose I could just write "lost" in the flock book lol but there's 5 to do, and if I did get inspected I don't no if they'd believe me