Having had to do it today....
In England, contact your local animal health office who give you the "fallen stock" helpline number.
they deal with fallen sheep (but have a "Daily quota") goats, scrapie infected animals.
With animals of a certain age, they offer free collection to take scrapie tests via a brain stem sample. the knackers collection is within 24 hours of them taking your details
It is ILLEGAL to bury or cremate any sheep, goat, cattle etc on your land, in England.