Wha, like the illegal drug running into china, slave trading and turning whole continents into penal colonies? How did your empire benefit the Mauris or Aboriginies? Or american indians for that matter? Apartheid South Africa and the current Israeli-Palestine problem are both attributable to the british empire, likewise the problems in my own country. Indias a bad example to be using for your civilising effect, they had their own empires when you boys were pegging stones at the romans. A few unintended side effects cant be used to validate the whole thing, it was done for the benefit of the British people, nobody else. Instead of asking where would they be without you, maybe you should ask where would you be without them, would your country really be in the position its in today without the wealth its overseas enterprises brought in?
So many things to cover here...
The British Empire was first of it's peers to outlaw the slave trade and actively engaged in it's destruction.
India may well have had such empires, but they didn't have them come the 18th and 19th centuries.
I'm not even going to touch on the British involvement in Israel, since I've covered it in previous threads.
"likewise the problems in my own country" - And where might that be?
You're right in one regard - it existed in theory to serve the British people. Unfortunately, as you might find if you did some research, the British working class population was living in rather squalid condition - especially by the standards of some of the colonies.
Oh and before you once again ask what we should be thankful for as opposed to the world remember this: The British Empire burned itself out fighting against Nazi Germany - I'd say someone owes my ancestors a bit of thanks.