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Also don't forget it's an Indian dialect of English, with words and usages of English words that don't exist elsewhere in the world.

Indian dialect is derived from the colonial English. So, lot of words and usage can be found in British English.

I don't think that most of Brits are "doing the needful". Indian English has plenty of expressions that are exclusive to India.

Pretty sure "why did you redeem it?!" is a British English slang from the victorian era :)