Alphabet Challenge

The Alphabet Challenge is an attempt to tick off all letters of the alphabet in Tube stations using the fewest trains and stations possible. It has to be through consecutive stations, no additional railways (like DLR or Overground).

Geoff Marshall attempted this in a YouTube video uploaded on 17 December 2021 at: https://www.youtube.com/watch?v=rpY8Pi5aJ9k.

(Hint: all attempts MUST include Belsize Park, as it's the only station with the letter 'Z'.)