thanks to all of you for your replies.
I was planning ion getting a fridge van in time, but kitting it up for hanging carcasses could be a real faff, hence was thinking that a dolav liner (huge plastic bag) to cover the carcass would work, as they could then be laid down in the back of the van as opposed to strung up.
Will check with the LA once we get a property - until then, i will continue to use my carcass tray whilst its all for personal consumption.
Cheers
Steve