I checked out these guys on the weekend - a few minutes from my work!
https://www.atdautomotive.co.uk
Very classy place, and when I visited they had in a white I8, a 720s, a F355 and a Huracan getting detailed - people seem to know they're there!
He said that PPF wouldn't work on the sills as the texture would mean it would move about - have you found this?
For this I've been quoted £530 for exterior detail/paint correction, £550 for ceramic coating inc wheels, and £1500-£1800 for front/extended front PPF protection. All ex VAT I believe. so £3,300 for the full package. A lot to spend!