Your next challenge, should you choose to accept, is to try and use a London Terminals ticket at King's Cross at the Northern line gates to get to either Moorgate or Old Street. Good luck friend.
I accepted this challenge this morning.
Armed with a Gold Card discounted Anytime Day Single from Stevenage to London Terminals my ticket was rejected by the barrier at the Northern ticket hall at Kings Cross St Pancras.
I asked the barrier assistant to let me through and showed him my ticket. He asked me where I was going and I told him Old Street and he let me through.
We then had a conversation lasting several minutes about the situation. I referred to the poster being inaccurate and implied that to anyone ‘not in the know’ that they would have to pay more than they needed to. I suggested that the poster should be reworded to say something like:
‘Tickets to London Terminals are valid from this station to Old Street, Moorgate and Finsbury Park only. Please ask a member of staff to be let through the barrier.
Travel to any other station is not allowed and a new ticket needs to be purchased’
(I realise this isn’t quite correct as someone with a ticket to London Terminals from the MML isn’t valid but those from south of Bedford are issuedbto London Thameslink so wouldn’t be an issue, most from stations further north are probably valid into Kings Cross anyway. A solution would be needed for passengers on the HS1 with tickets to London Terminals but I’m sure a form of words could be found).
The member of staff claimed that the main reason for changing things was because of staff abuse at stations where passengers with invalid London Terminals tickets were trying to exit.
It does seem that despite the incorrect posters staff have been briefed so anyone encountering difficulties should persist, even though the overall position is far from satisfactory.