Kent Spitfires dramatically collapsed as they were edged out in their high-scoring Metro Bank One-Day Cup game against Durham at Canterbury on Sunday. Chasing a target of 308, Kent looked like they were coasting to a comfortable victory which would have kept their knockout chances firmly alive when wicketkeeper Harry Finch (104) and captain Jack Leaning (81) delivered a mammoth stand. But almost unbelievably, Spitfires slipped from 223-2 to 294-9 and ended up on the losing side. There was a one-minute silence ahead of the game in memory of former England batsman Graham Thorpe, who died on Mond…