Betfred, 100 GBP or about $175, must be bet on an event with 3 or more outcomes ( ie soccer) If the bet wins they add up to $175 to it. They double the payout in other words ( to $175). I believe there is no rollover, and you can withdraw right after you win. I'm going to do them Tues or Weds.
You may have never heard of them, but they're a big Brit book. Just pick a soccer game, bet one part with Fred, and the rest with Pinny, in a way that you win no matter which team wins, or if a draw occurs.