Originally Posted by
psychokilla
Left to right, you'll end up in Euston Square, top to bottom, you'll end up in Euston?
There's also the Victoria Line which is kind of diagonal from bottom left to top right.
If you are somewhere around the British Museum without luggage, it's probably quicker to walk than going by underground. If I'm between Oxford Circus and Tottenham Court Road I'd catch a bus to Euston.