Re: Lack of customer service...
A couple of things.
It is not endemic, many customer facing people are genuinely helpful and are a pleasure to deal with. That you only see the poor examples is more indicative about you than British society.
Border staff are not really "customer" facing, they are there to police borders not greet you with a welcome to Britain smile. They were dealing with the sh1t the best they could and would still be there hours after the blog bore had gone.