So plan A (stagger to Aldgate, change at Finchley road and then fall asleep until the end of the line) is out of the window. Plan B (the northern variation) involves going via Princes Risborough and Aylesbury, which is not an approved route. Plan C involves riding up a hill or two from Northwood or Beaconsfield or Berkahmsted. Plan D involves a Brompton, which isn't really fit to ride any distance at the moment (and I'm certainly not fit to ride a Brompton any distance). Plan E involves begging a lift.
Choices, choices.