I'm English. It's not a culture thing. Most of the guys here won't call you 'darling' or 'dear' when you just meet them. My boyfriend called me dear sarcastically from when we first met (11 years old) buuut only called me it seriously about six months inot our relationship. He's a big flirt though, I'd be put this down more to being a flirt than culture.
Up here in the North of England it's not the standard thing but it's not uncommon, people always go alright mate when just seeing you and hello luv is a big one don't hear darling as often but it could be a thing.