Really? I rarely have dinner over 20 pounds a person (which isn't cheap, I get it, but for London prices it's also not expensive), and I haven't seen a bill without service charge added in months (excluding Whetherspoons). As soon as I don't manage to order at the register, and instead someone brings a menu, there will be a service charge.
There was one restaurant recently that didn't have one, and we almost freaked out about it.
There was one restaurant recently that didn't have one, and we almost freaked out about it.