I would take it off the market fully for a month, have it MOT'd 6 months tax cleaned and a minor service. Then start from scratch, lower the BHP claims as to be honest if you search arround you'l probably find your posts on here - Modified car enthusiast = Forums = easy back ground checks!
Also Ed this post isnt helping matters so I would be very quiet for a month on here as well, also put all the paper work in a folder and photo it! to show you py attention to the details, why? if you pay attenetion to all the details here you will give the impression of paying attention to the details when modding the car
Also another real big one "drive the car like a saint" do not show off on the car, demonstraight the accelleration and braking in a safe manner!