Oops, I clicked reply by mistake, before I had finished my message, and don't see an option to edit my posts.
Thanks for all the good information. It looks like the M3 roof rack is a bit of a nightmare!
Irrespective, I need to get one for my car (which hasn't been delivered yet), but there don't seem to be any roof bars in stock at Tesla. How often do they get new stock in (in the UK) and is it likely that they will have some in the next 3-4 weeks for when my car arrives?
Thanks