Controversial & Contradictive
I used Williams for my front wing as well, nice paint job. Just check that they put your wheel arch linings back in properly with all the bolts, they missed two bolts off mine which I spotted when I was checking the work. Also, check that they put the security wheel-bolt key back into your tool-kit. They remove the wheel to do the wing, and use your own key. They lost mine, but I checked my tool-kit before I left the workshop, and they arranged for one to be ready for me at Lancaster around the corner when I got there.
Are you getting a courtesy car? I got a little mini cooper chili to play with, quite fun for a few days, but could never live with it.