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The information is like I suggested is easily available on Wikipedia. It says the late Queen Elizabeth II father, George VI was the last emperor of India (not England - but of course his home was in England) until August 1947 when the British Raj was dissolved.
There are no pretenders to the title, even if they might style themselves like that to themselves or their friends. They are not fooling anyone except themselves (in their own minds). In fact, people who style themselves Emperors of England usually belong to a mental asylum, that is a psychiatric clinic. Though usually I've heard , apocraphally, that its usually Emperor Napoleon of France or the Pope or the like. But why not Emperor of England - seems just as likely to me.