May a passenger use a Boundary Zone ticket when not in possession of the relevant Travelcard, assuming he/she starts after the boundary?
(The specific example I have in mind is something like Boundary Zone 4 to Ashford International and starting at Bexleyheath. The reason is that the fare from Bexleyheath is considerably higher due to Southeastern changing the cheapest fare of a pile of tickets from the London zones to Kent from route NOT VIA LONDON to NOT EBBSFT/LONDON, whereas the Boundary zone ticket is ANY PERMITTED.)
(The specific example I have in mind is something like Boundary Zone 4 to Ashford International and starting at Bexleyheath. The reason is that the fare from Bexleyheath is considerably higher due to Southeastern changing the cheapest fare of a pile of tickets from the London zones to Kent from route NOT VIA LONDON to NOT EBBSFT/LONDON, whereas the Boundary zone ticket is ANY PERMITTED.)