Trains are dirt cheap. I got a London to Scheffield ticket for 13 pounds or something. First class, too, not that that means much. Cornwall might be a bit remote, so you might want to rent a car (drive on the left, and make sure you have GPS!) but Manchester to London by train should be no problem.
Be warned though that their online system doesn't recognize Canadian postal codes, and therefore won't let you input your address to buy by credit card. At least it didn't when I was there.
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