I've kind of put it out of my mind, I'm not doing anything til end of Jan/Feb anyway.
I'm fairly sure fixed seats are a fail in an MOT, unless you can prove it's a purpose built track car in which instance it's the MOT testers discretion?
When I eventually get a cage, I'll used fixed mounts along with harnesses. Til then, buckets, inertia reel belts and sliders are perfect for hooning about, and don't ruin my suits.