In la.ac.uk,
Alan J. Flavell typed:

What about passengers landing at Heathrow - will they be able to buy a
travelcard there? Presumably if the Piccy line isn't operating, then
the LUL station wouldn't need to open - if so, where would the punters
get their travelcard?


The Piccadilly Line *is* open between Acton Town and Heathrow; I
therefore presume that the ticket-office will be open and that landing
passengers will be able to obtain Travelcards there.


--
Bob