I'm not British but I'm currently staying in the UK and i can confirm most of them are either agnostics or atheists. I asked lots of British friends "are you Christian?" and the replies I always got are "I don't go to church and i don't believe in jesus." Tbf i never got any answer as "yes i am a Christian" from any British i have asked. Churches are everywhere but always empty. I've never seen a church on sunday with more attendees than a mosque on friday.
