It appears I am losing my way, as my time here dimishes so does my ability to tell which tube can I take to get home. The Northern Line was unaccessible the way I normally go home, so I went to take the Victoria line one stop and swap - to save time.
Turns out I went the wrong way, added 15 mintues to my journey. I blame the lavendar oil fumes, I had just had a massage. Sigh.