Hi Oli Some very interesting things to think about . My caterham is a bog standard 125 sigma still on its original ZV3's on 14" rims I assume I will be able to detach the petty strut when not in use and when removed won't unduly affect the passengers comfort ? I am also going to assume a petty strut is available as an addition to the FIA bar I purchased this year ? I have an ARI full face helmet from my motorcycle days I guess I need to check the labelling. Do I really need fireproof overalls and fire proof gloves ? I am starting to feel like Burt Munroe ... I am thinking I could use my 13" rims currently with worn AO21's and use the current favourite tyre when we know what that is to be. Do I have to have a cut off switch or can I label up the ignition, so I need a fire extinguisher? I am also guessing a standard rac speed licenceis ok and no medical required ? Anything you guys have missed out ? All your responses with these questions are much appreciated. Longy