Well, no, I don't, although that's not to say I haven't seen a few train wrecks at the comedy night in my time. The workshop will be taking place in the upstairs venue (known as "The Attic") at The Railway Inn on St Paul's Hill in Winchester (on the opposite side of the car park from the train station).
Here's a map, for
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The folks who run The Railway (again, the pub, not the transport network) live here: http://www.railwaylive.co.uk/