Cheers for the replies.
Some part of a sheep's skeleton had crossed my mind but I couldn't make up my mind, or work out, which bit.
I'm not convinced of hip bone tho, it's hard to see by photo but the two larger ends are pointing in different directions, one down (towards to table) and one up (towards the table) and the two smaller ends seem to be two separate bits, as opposed to one broken.
It's certainly very intriguing
