So I have this theory. The UK has a reputation for having lots of rain, fog, and generally being grey and miserable. You also have a reputation for tea. It is culturally ingrained in the phenomenon of "tea time".
My theory is this: your whole country loves tea, and probably has a boiling pot of water on every stove, every day, at 4:00 PM. This is contributing a LOT of water vapour to the atmosphere, which possibly then results in clouds, precipitation, fog, and generally gloomy, crumby weather.
Basically, tea is probably responsible for your bad weather.