Back in 2016 I did a Get To Know Your 7 day down at Gatwick, with Caterham's Simon Lambert. While the Club's 3,000 members will have 6,328 views about the right thing to do (I'm too ignorant to have a view), here's Simon Lambert's list from back then:- 13” wheels. Feels much more 'planted'.ZZS tryres. Better in wet and more progressive (also ZZR).4 point harness, correctly worn (tight to breathe). Better connected to car. (Schroth harness if you’re thin). The tighter you're tied in, the faster you drive.Rear anti-roll bar (already got a front one) £150. Take off in wet. A softer car is quicker in wet. Orange is basic ½”. Red is 5/82, so a bit stiffer.LSD. Especially in 160 – 170 bhp.Brakes. Big brakes on front. Bigger master cylinder.Then you can start upgrading the engine