Forgive me if I've been missing something, but...
Went into London from Baldock this morning for various dull reasons. Bought the ticket from TrainPal, was surprised how much cheaper it was than Biggleswade, but thought little of it. However, when I got the ticket up for the inspector on the train, I noticed it was a "London Terminals" ticket - not a Thameslink one.
"That's annoying," I thought, thinking I'd have to hop off and on again at FP or StP, but I thought I'd double check on BRFares. And lo and behold, this is one of the sections for Baldock - Blackfriars:

OK, so £2 difference isn't much, but unless I'm misunderstanding, does this mean London Terminals tickets are now valid through the core? Were they always? TrainPal certainly seems to think so. The barriers are Blackfriars let me through, FWIW, though that's not necessarily an endorsement.
Went into London from Baldock this morning for various dull reasons. Bought the ticket from TrainPal, was surprised how much cheaper it was than Biggleswade, but thought little of it. However, when I got the ticket up for the inspector on the train, I noticed it was a "London Terminals" ticket - not a Thameslink one.
"That's annoying," I thought, thinking I'd have to hop off and on again at FP or StP, but I thought I'd double check on BRFares. And lo and behold, this is one of the sections for Baldock - Blackfriars:

OK, so £2 difference isn't much, but unless I'm misunderstanding, does this mean London Terminals tickets are now valid through the core? Were they always? TrainPal certainly seems to think so. The barriers are Blackfriars let me through, FWIW, though that's not necessarily an endorsement.