Nice to meet you both.
Thanks for the tip. I'm not sure if it's been mapped to run on UK fuel.
I run it exclusively on V-Power with the odd tank of Tesco Finest. It had a session on Surrey Rolling Road just before I bought it, and the only advisory was for an uprated fuel pump which I have since had fitted.
Edit: Done some further research and found (amongst many) this post. Mines a '95 STI RA. The author suggests that my car should be ok to run on 99RON.
Did I just open my first can of worms?