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They're in Watling street, Dartford http://www.hispecmotorsport.co.uk/
Thats per disc so you'd be looking at £50+vat
I would strongly advise against you taking your existing discs off, as you car will be off the road until they get round to it, which could be any given amount of time unless you can come to arrangement where they do it while you wait(unlikely)
Or you could try ECP as they do ATE POWER DISCS with a fancy groove put into them already.
Can you suggest a suitable vendor?