Any question answered...

I forgot Amey was looking for beater cranks,there's a triple on eBay for £56 inc bb, sell the spare chain rings and bolts... You are probably looking at a ss set for £40 odd quid.

Brand new Alfine (FC-S500) complete with chainguard and BB is £48.52 at Rosebikes, hard to beat for a beater/shopper/pub bike I'd have thought. Silver or black, 39t or 45t, 42.7mm chainline to suit fixengers but with a skinny ring so you can run 1×9 if you need gears.