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Mr Tao said his adventure had motivated one of his flatmates, who is also Chinese, to attempt the same trip.

Before having an argument between family or flatmates about the heating, try touring the property to work out how to save energy.

The pair are now best friends and flatmates.

"I remember one evening getting back to my flat in London, waking my flatmates up because I was just in a complete state," he says.

Her flatmate later contacted the police on her behalf.