King's X is a big station; always found it a little confusing with the various platforms to different directions.
Leicester Square it is only Piccadilly and Northern lines, plus he gets to go by Mornington Crescent, the only tube station to have its own thread on FT.

The train Paris-London is an original idea. Along that line, he could go to Amsterdam by train, spend some time there and then take the ferry to Harwich. I'm sure every suburban frat boy would love Amsterdam. Even in winter.