My (limited) experience of driving the M25 and the memories of working with colleagues who used it to get to work suggests after doing the journey a few times you can pretty accurately estimate how long it will take - BUT there will be not infrequent occasions when you will have a major hold-up, doubling your journey time, if not more.
It seems to me we have a situation where the road just about copes with the traffic until something, perhaps quite trivial, disturbs the equilibrium. All it takes is a strategically placed broken-down lorry, or something similar.
At least you can read or use your laptop on the train (if you can get a seat).
Edited by FP on 08/03/2013 at 17:50
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