I expect you've already seen this, but if you open an account with:
http://www.bethilo.com/ptv/SwindonSpreadBetand place 3 separate bets of £5.00, you will receive £5.00 for every goal Swindon score during February (max payout £35.00)
So even if you lose the £15.00, as long as Swindon score 4+ goals till the end of Feb you're a winner.