It is also an accountability issue when you have no info except : You are in the UK and "mature" . So age range you could tell someone you anywhere from 40 and up and location wise you could be in any of 4 nations. And presumably there is a female in the mix somewhere.
But if you are just here to mess about you will be 45 year old in Cardiff to one, a 65 year old in Glasgow to another, part of an English couple to yet another and hardcore Belfast lesbian to yet another, Never mind how many might be annoyed if you are 6 feet tall and thus out of the league of most women regardless of age. Or 90 lbs.
Do what you want but don't be shocked if no one serious replies when your post is the equivalent of "Car for sale in UK " Or if all queries are as vague as yours.