Neil Williams wrote:

Going from Euston to Blackfriars in the morning peak I can use the
Northern Line, and stand with someone's head in my armpit and my back
arched due to the low ceiling for 10 minutes.

You've got my sympathy, Neil. I gave up using the deep tubes in the rush
hour because of the sheer miserable nature of the journey. I try to use the
sub-surface lines and on-foot as much as possible during the peaks.