5.20pm: Well, it wasn't pretty, by any means, but Surrey dug themselves out of a hole of their own making to reach the last four of the Blast. Jason Roy got them well ahead with that 20-ball half-century and Robin Peterson kept cool at the end... It's tough on Worcestershire, who have still never got further than the quarter-finals, but their total never looked like being enough. All of Surrey's bowlers chipped in, only Richard Oliver and Joe Leach made it to 20 for Worcestershire; big city trumps small town again. With that dynamic in mind, Birmingham are the outsiders travelling to Chelmsford for the evening fixture, with the toss about to take place - join Gnasher for full commentary starting shortly.

Up comes the field, just a couple needed to win