100 Best British Films by Time Out London
Some big names contributed as voters like Mike Leigh, Ken Loach, Terence F*ckin' Davies, Wes Anderson, Cuaron, Gondry, Sally Hawkins, and Olivia Williams among others including prominent critics especially from the UK. You can view each voter's list, and many write up their criteria.
The Start the Countdown tab includes capsule reviews for each film. The Full List tab doesn't have capsules, but as you'll find out, clicking the movie title or picture will bring you to the Countdown list version anyway.
My only complaint is that The Long Day Closes
is criminally ranked low!