"1. If i use sniper on an item and there is ANOTHER bidder using sniper WHO will win the actual auction?" This brings up recent memories, but who ever has the highest bid.
"2. If i put a maximum amount of say £10.00 and just before close the price is say £2.00 with a bid increment of say 50p does sniper make my bid £2.50 providing NO ONE else bids on the item?" The bid increment at that range is .25, at least in the U.S.
"3. Does sniper take a percentage of the actual WIN amount or the maximum amount i enter?" WIN amount.
I'm keeping my fingers crossed.