Betfair £50 In-Play Free Bet Offer on Man United v Southampton and £30 Free Bet Betfair offer a £50 free bet to new and existing customers when you bet in-play on Man United v Southampton! Read Full Article Bob Cohen | 18 August 2016 | Football Betting Offers, Free Bets and Bonuses| Betfair bet £10 get £30, Betfair free bet offer |