Paul,
Your reg/rec is probably ok.As Shazaam says,rewire the burnt bit of wiring and use new heavier duty connectors.Charge your battery and test the charge voltage.You can get auto electric wiring materials from good car accessory shops or there is a place not far from you,Merv Plastics(?),they used to advertise in the bike mags.
They have changed their name,
www.vehicle-wiring-products.co.uk [Edited on 30-6-2003 by keefyboy]