Wasn't there a guy selling a turbo'd 182 on here not so long ago for circa £5-6k? I seem to recall he since dropped the price (nearer £4.5k), but not sure if it's sold yet?
That's a 182 though.
Is this company going to be offering already-converted turbo Clio's for sale, or is your ecu & gubbins just part of a/their turbo conversion kit?
In a similar vane, I think there'd be a good market for you personally if you could offer a complete conversion kit, be it diy or drive-in/drive-out, that's competitively priced against the likes of K-tec.
http://www.k-tecracing.com/show_product.asp?id=2107 - £6k+ is a p1ss take, imho.