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Since both Bank and Waterloo are on other lines, the inclusion of the W&C line is neither here nor there.

I may be a relative noob, but I live close enough to Amersham to help out if it's required. I can be up there for the fiveish start, perhaps help out for a few more hours, but I'll have work that day from 1600 onwards, so if I end up going into central London I'll have to be on my way back by 1400.

Count me in if you want me