that there was a concensus that it was, more than likely, Arthur Sullivans, I've given up trying to find out if it's authentic or not - it's just going to take too long/cost too much money (Wellingborough not a good place to live if you have something that could be of value that isn't furniture LOL). So I've relisted it on ebay - with a reserve of £50 (if it reaches that I'll be happy TBH - anything more would be a bonus) and a starting price of £15 - made it clear (I hope) in the listing that I don't have any 'proof' of it being a very early edition or the 'real' signature but put quite a few pictures so hopefully anyone that knows their stuff and is interested will be able to figure it out from there.
Now I just need to sit back and see if it gets any interest/enough bids to sell LOL.