Britain does not have colonies. You might be thinking of the British overseas territory but the total population of those islands is less than 400,000
Not just them, but I'll leave it at that.
Some years ago when the United Nations started critiquing colonies, the British overseas ones were rebranded as "territories" and "dependencies." (The French still have overseas colonies, the so called DOM-TOMs, and also some nearer to home.)
Some of these overseas ones like Gibraltar and the Falkland Islands have overwhelming support for British rule thanks to an aggressive neighbour. Some of these remaining colonies have active independence movements with varying support.
Okay then if you're just going to be cute and nonspecific there's no point in continuing this discussion. I'm not interested in trying to decipher vague insinuations.
Fun fact: they've not been called that in 23y, they're DROM-COM
A reasonable case can be made that it should be Irish territory, not British, but that is a territorial dispute.