I think most Brits (I am a Brit) would write "very" when they mean "extremely" rather than "quite". In spoken English there is a lot of nuance, but if you said

I think most Brits (I am a Brit) would write "very" when they mean "extremely" rather than "quite". In spoken English there is a lot of nuance, but if you said a meal was "quite good" it would often have a connotation of "better than just okay" rather than "excellent". Saying a meal was "really good" would be closer to "excellent".