I sometimes make a journey to Mornington Crescent from Woodside Park to visit an office between there and Euston Station. Recently Mornington Crescent has been closed due to staff shortage. Surely I shouldn’t have to pay the fare to zone 1 if the station is closed or do TfL expect me to walk from Camden Town.
Sadly I think they will expect you to pay the fare to Euston if you go there. They do sometimes alter the fares if a station is unexpectedly closed, but not if the alternative is in zone 1.