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@Vince
Changing the spindle and keeping the existing BB cups is the best option.
Second best option is a threadless BB so you don't have to worry about cup threading ( which could be french, swiss or english on mid 80's Peugeot's).
Here are the crank nuts that you are after:
http://www.ebay.co.uk/itm/WELDTITE-COTERLESS-14MM-CRANK-NUT-NUTS-PAIR-PEDAL-ARM-08030-CYCLE-BOLT-SCREW-/310435630319?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item484767ccef#ht_1295wt_1163
Any independent bike shop would charge you 50-75p for one of them.
Cheers
Vince