Love Big Train, some seriously good sketches. Here's some more of my favourites (outside of the ones you've already mentioned).

Unfortunately my favourite sketch, 'Cake Factory', isn't on Youtube any more. That was where I first realised how brilliant Simon Pegg was as a comedy actor.

[1] https://www.youtube.com/watch?v=zcAqR-Hs9II - Join the Army

[2] https://www.youtube.com/watch?v=rxUm-2x-2dM - Do You Speak English?

[3] https://www.youtube.com/watch?v=Yyj5cv5FPWA - Eagle Line Super Train

[4] https://www.youtube.com/watch?v=rxiOfepOxe8 - Evil Hypnotist

[5] https://www.youtube.com/watch?v=TIIAQME1Uhg - Jockeys in the Wild

[6] https://www.youtube.com/watch?v=9GmmAUbfhMU - Champion sprinter

[7] https://www.youtube.com/watch?v=CKRBYGhqI8Y - On Call Surgeon

[8] https://www.youtube.com/watch?v=XMh9CDNQhBg - Office Politics: Jesus vs Devil