What's the cheapest for me to travel in December for 2 nights from Middlesbrough to London ? Because

Travel on a First Class service from Monday to Friday and you can enjoy free food, snacks and drinks from our mouth-watering menu (including our renowned bahamas business hotels Great British breakfast) and alcoholic drinks will be served from 11am.
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What's the cheapest for me to travel in December for 2 nights from Middlesbrough to London ? Because it's saying over £200 each return for me ? Can you find a route that's close to me to London please .