http://www.ebay.co.uk/itm/Acor-Front-Derailleur-Alloy-Clamp-with-Cable-Stop-28-6mm-31-8mm-or-34-9mm-/140995983227
I've just realised, the seat tube isn't circular below the front mech so it won't work after all ffs
@PhilDAS started
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http://www.ebay.co.uk/itm/Acor-Front-Derailleur-Alloy-Clamp-with-Cable-Stop-28-6mm-31-8mm-or-34-9mm-/140995983227