What a peach of an RSI you have there Fella, I bought a S1 from Mike Young garage of Ilford back in 89/90, they had a Graphite RSI parked next to mine in the showroom with 6,000mls rec, nearly bought it over the Turbo back then, if my memory serves me it was nearly £2k cheaper too. They are just a great looking car with superb Scheel (German I think) seats, so comfy.
If I didn't have my Sapph I would be very very tempted to have a real good look at yours, looks superb.
Shame you have to sell...