Originally Posted by
happywondering
Mr Copper was the old dude the Doctor saved in Voyage of the Damned who realised he had a lot of money on his credit card after the doctor took him to Earth so he could live his life there.
Ta,
. I'd forgotten about him.
So it looks like Mr Copper has been doing something other than keeping a quiet life.
Who knows, he probably had the cottage next door to Harriot. He did want a cottage of his own.