Jack Mynott hit a six off the last ball of the match to give South Wilts a break-taking five-wicket victory over Havant in last night's Southern Electric twenty20 Cup final under the Ageas Bowl floodlights.  Mynott needed to hit three runs off Ben Walker's last ball to take South Wilkts past 156-5, but cleared the long-on boundary rope to win it with a six.  South Wilts looked to be strolling it when Tom Morton (46) and James Hayward (36) took 80 off the first ten overs, but Havant's spinners clawed it back to set up a thrilling finish.  South Wilts needed 17 to win off the last two over and 11 off the final over - and won it off the very last ball.