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@Mr_Bump
Sounds like you need a standard long drop caliper, these are usually 47-57mm drop and available widely and at not great expense. You can buy a new set of Miche(F&R) for £18 posted from Wiggle in black or silver or if you just want a front there's these single Acor for £13 http://www.ebay.co.uk/itm/Acor-Dual-Pivot-Brake-Calipers-Road-Bike-Cycle-47-57mm-/110782170129?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item5f78b2536b
Generally (but not always) it is only the rear brake that people need the extra long drop when fitting a 700C wheel on an older frame designed for 27" wheels
If you don't know how to measure the drop you require here's how