What are some British films what are proper great

Can we make a definitive list? I mean, you've got all those moody post-war kitchen sink dramas, the Pinewood & Ealing comedies, a lot of 60s stuff - both swinging and spying -, Merchant Ivory last-days-of-empire stuff, all the handmade films and so on

I'm going to list some of mine, please add to it

Ipcress File
Kes
The Long Good Friday
Nuts in May
Life of Brian
Withnail & I
Letter to Brehznev
Remains of the Day

moar please