It is quite a long way from London however, I'm sure there can't be that many people who choose to do such a long journey.
Additionally, in my experience, the rush hour leaving London, especially those northern stations which aren't convenient for the majority of employment, such as City workers don't start to get busy until about 1730, as those make their way to stations on tubes, buses and taxis from their place of employment.
Additionally, in my experience, the rush hour leaving London, especially those northern stations which aren't convenient for the majority of employment, such as City workers don't start to get busy until about 1730, as those make their way to stations on tubes, buses and taxis from their place of employment.