From what I've seen, the 'teddy bear' costume I linked to above is about the nearest we're gonna get to the Mark Wallinger
. It's not exactly a match.
I've phoned around a few more costume shops. Most of them are closed already, or not answering the phone. There's one in Bathgate that has a selection of bears to rent (£40ish) or buy (£60ish), but they don't have a website to view them. It seems we are unlikely to be able to rent several the same as most places will just stock one bear, or a handful of different bears.