[migmog]

I got a quote from Chris Gander - £4121 inc VAT, but that includes 3(!) catalytic converters at a grand apiece. Looks like just the two silencers and bits & bobs will be nearer £680.

I also got a quote from Cambell at C+C, £860 all-in including fitting.

Will ponder some more, but I'll probably go for the SS system, even though that means taking time off work to get the beast through to Glasgow.

Thanks for the recommendations!