Not a bad list though I'm more concerned about the lack of Hammer and Powell and Presburger than Ken Russell.
What's the criterion for this anyway? If it's just favourites then I'd add the following. Though films are such international affairs it's hard to say whether all of these are British:
Black Narcissus (Powell) (Pressburger)
Breaking The Waves (von Trier) (Asmussen)
Circus of Horrors (1960) (Havers) (Baxt)
Croupier (Hodges) (Mayersberg)
The Day the Earth Caught Fire (Guest)
Day of the Jackal (1973) (Zinnemann) (Ross)
Diamonds Are Forever (1971) (Hergesheimer)
Dr Strangelove (Kubrick) (Southern)
Dracula (1958) (Fisher) (Sangster)
From Russia With Love (1963) (Young) (Maibaum)
Get Carter (Hodges)
Hands of the Ripper (1971) (Sasdy) (Davidson)
Hell Drivers (1957) (Endfield) (Kruse)
I'm All Right Jack (1959) (Boulting)
In Bruges (McDonagh)
Kind Hearts and Coronets (1949) (Hamer) (Dighton)
League of Gentlemen, The (1959) (Dearden) (Forbes)
Matter of Life and Death, A (1946) (Powell) (Pressburger)
Naked (Leigh)
The Nanny (Holt) (Sangster)
Peeping Tom (Powell) (Marks)
Quatermass and the Pit (Baker) (Kneale)
The Red Shoes (Powell) (Pressburger)
Skyfall (Mendes) (Logan/Purvis/Wade)
Thunderball (Young)
Tinker Tailor Solder Spy (Alfredson) (Straughan)
2001: A Space Odyssey (Kubrick) (Clarke)
Under the Skin (Glazer)(Glazer/Campbell)
Unearthly Stranger (Krisch) (Carlton)
Vampire Circus (Robert Young) (Baxt)
Village of the Damned (1960) (Rilla) (Silliphant)
The Virgin and the Gypsy (Miles) (Plater)
The Wickerman (Hardy) (Shaffer)
Witchfinder General (1968) (Reeves) (Baker)
Zulu (1964) (Endfield) (Prebble)