£100 in the end. But that was for the pair of leather seats, full leather/alloy trim door cards, Mk2 centre dash trim, entire centre console, leather cubby box lids and footwell light panels - all then delivered down to me from the Midlands on a pallet. I consider it a bargain really.
I also had to spend £30 on the Mk2 heater box to fit the centre dash trim. Finishing touches were then £20 for a leather steering wheel with the colour MG badge and £12 for the alloy gear knob to match everything else.
So I spent around £160, but I expect to make some of this back selling on some of the spare bits I didn't need, and bits I removed. Good transformation for the money I think.