They have to do the bubble window of the new shape Clio in one of four ways:
1) Do it in multiple stages with different shaped bits of tint film
2) Do it in one piece but tuck/fold the edges and bond them against the overlapping section (silly but Ive seen it done!)
3) Do it in one piece cutting off the overlap and shaping it so theres bits where theres a slight join but not as bad as doing it in multiple sections, or
4) Do it in one piece and heat-shrink the sides with a glue gun/hairdryer/similar device so they wrap around the curves.
theres no easy way to do it.
Legality wise, 65% tint (ie. 35% transmission is the legal limit) - this is a light/mid smoke tint. However, the glass on Clios is already tinted about 32-33 per cent (67% transmission), so even a light to mid smoek tint will be illegal strictly speaking.
Dark smoke (80% tint) looks the best but is obviously illegal. However, I know a lot of people witht his tint and it hasnt attracted any problems from the rozzers so far. Ive got mine booked in for 80% tint all round on Tuesday, so Im hoping not to have any problems even tho its illegal!