Um... not living in the UK, I'm not to sure what they do. As far as i know they don't celebrate it, its celebrating the american revolution (right?) thus, only in America. But they have a similar event called bonfire night (or guy fawks night).
Remember, remember the Fifth of November,
The Gunpowder Treason and Plot,
I know of no reason
Why Gunpowder Treason
Should ever be forgot.
Guy fawks FTW
Any other V for Vendetta fans?