Just to update you chaps, a company in Keysoe nr Beford re-web belts for about £50 each, and they can match the 250 belt exactly!
http://www.seatbeltservices.co.uk/index.html
Just trying to persuade the mrs to have yellow belts, as she wants them to remain silver (but still re-webbed) so they are clean, not 6 years of grubby mits! Also, this company is all up to BSi etc and therefore meet all regs - don't fancy any 'mods' to what could or could not save your life... see me older thread about our 1st 182 - It can happen so not worth the risk, but this is def a cheaper alternative whatever colour I decide!
Do you reckon yellow belts will look good on a LY clio, prob would need to do 4 of the 5 (rear centre no point as always retracted)...