I’m a Brit and our tipping culture has always been totally different, though things have changed in recent years.
historically Brits didn’t tip unless the service was ‘ above and beyond’ what normal service was expected to be. That started to change in the late 80’s for a more European approach of a recommended 10% tip for meals. If the food and service was good. Other tips are a rarity.
I know the American model is different, and many lines run along the American model.
I pay the auto gratuities, but don’t really do any other tipping, I will be polite, friendly and tell the crew member if I think they are doing a fantastic job. It’s just the British way and cruises are very expensive to start with.