Sorry, I should have put an update post here. There wasn't much interest around the time when I first made this post and I'm getting a not-too-bad wage from a five-day job this week so I'm not so desperately needing to sell it now.
I'm also planning on holding on to it for now as a back-up for this year's UK championships (whenever they may be) as I'm not 100% sure that I'll have Drumroll II done for then.

However, just for reference, for Drumroll in full working order but without radio gear I would be looking for £550-£600.