I’ve had the under-tray and forward wheel arch trims off several times, most recently to fit new radiator and hoses, and then again to check for a potential leak that was just an overflow issue whilst ‘burping’ the system. The process is so tedious and the vertical elements on the undertray make the process a pain, particularly if you only really want to access under the radiator area.
Anyway, I decided to drill out the pop-rivets that secure the vertical pieces to the tray itself, and refitted each piece back to the car separately. I can now remove the basic under tray without touching anything else!
Has anyone else done this?