I have the potential opportunity of a job in London again - I've worked in the city before, did it for 2 years and didn't especially mind the commute, but I used Waterloo and City to go from Waterloo to Bank. Crowded but doable as the train was always empty when it arrived.
With this job I'd have to go a few stops on the Northern line to Tottenham Court Road. Does anyone know how bad that section is in rush hour, from Waterloo - I'm sure it isn't nicknamed the Misery Line for nothing?