Re: To be fair...
"Woah, customer service lines in the UK are premium lines?"
They aren't. In fact the rules for premium lines specifically prohibit it.
But we do have a set of not-strictly-premium but not-bundled and therefore more expensive than usual numbers where the called party gets a cut of the termination fee.
Basically our incompetent regulator created loads of loopholes and the ingenious phone companies drove a horse and cart through them.