UK sourced versions of the stuff thats no longer cheap from japan (rackbushes etc)
and generally carry on as before, sourcing/making parts suitable for actually driving cars rather than just selling on chinese tat to pose with like your 'competitors'
More engine tuning stuff, like pistons etc
Maybe a few more wheel options in 4 stud (4x100 and 4x114) as theres a few of us running 4 stud setups still
General service parts maybe? I can never be arsed to go round the corner to the auto-spares place for parts AND I know you guys will deliver quickly without fail. Stuff like filters/plugs etc?
Larger range of stuff like steering wheels etc?
Considered dabbling in secondhand wheels? It might not be something you want to do but its a fairly lucrative business if you've got the means to buy in from Japan and the room to store them [the latter issue pretty much the only reason I'm not actually doing that right now rather than 50+ hours a week!]. Actually, just giz a job and I'll do all that