Where can you borrow a deceased horse?

Your best bet is a taxidermied animal then, not a recently deceased one.

Nobody's going to want you to recreate St. Wenceslaus' Ride with an actual horse unless it's taxidermied.

Man, you guys do some weird stuff around the UK.
I don't think people usually taxidermy horses. And laws don't allow them to be kept around - at least over here.

Can't you just... Get a photo and re-create it?
This whole thing is kinda macabre...LOL

Have you ever been around a dead horse?
My Mom used to say there was nothing deader than a dead horse, I never realized what she meant untill I had to deal with a few dead horses.

You would hveve to find someone who is going to put their horse to sleep, quickly after the horse is dead, and before riggomortis sets in, move the horse into the statue position, wait for hard riggormortis to set in, then do what stuff you need to do. You will have a window because after so long riggormortis will leave and the horse goes limp again. Without riggomortis set in the horse will be limp like a noodle and that could be rather discusting. Better still you might need to get a young horse with better muscles least you rip a leg off, hanging the poor creature upside down.

Whoever lends you the horse will need to be a true patron of the arts.

I wouldn't call any of that "art"... sorry.

Does this project require a real horse?

If not, it might be cheaper to order a foam mannikin for your use, since horsehides are generally pretty expensive.
The following sites are based in the US, but they should be able to ship overseas... There's a bunch of zebra poses and a few horse ones and since they're really just rigid foam, they're pretty easy to alter to a pose you like.

http://www.vandykestaxidermy.com/Default.aspx
Research Mannikins Taxidermy Supply Store
McKenzie Taxidermy Supply - Leading supplier of taxidermy supplies

If you can stomach it, here's a tanned horse hide that should be able to ship to the UK. They're listed as a domestic species, so getting it over the pond shouldn't be too much of a problem.
Lifesize Adult Pony Light Sorrel Taxidermy Quality Soft by Furries

I googled it and that is just not possible with a real dead horse. Look for a new medium.
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His art is defiantly unique 0.o I would go with some type of clay instead. No offense but it never sat well with me when people consider a dead animal stuffed art. (was an art major for 3 years).

Its in better taste(not to mention smell) to use a different medium.

Have any of you not heard of this guy then - his exhibitions have toured most of the world now and you can donate your body to him when you die if you want it preserved for all to see.
Gunther von Hagens

That is a whole different story, IMO. Rather science than art. Very interesting and educating. A bit scary, tho.

Yes, I've heard of him and seen a documentary about his work. I'd love to see the exhibition but what he does is actual preservation, not just use dead bodies and call it 'art'. Gunther von Hagens is a scientist, not an artist.