Tradex told me they wouldnt allow a cosworth on my list of private use cars, but they dont specify any restriction on modified cars, so my 3 door is fine as its technically a modified base model, even though other than the chassis number no one would ever be able to tell it wasnt a cosworth, so that worked out nicely

Mine is just a part time policy though, not a full trade policy, for people who have a fulltime job but then in some way are in the motortrade through a second job or as a hobby job