LESTRADE: So the whole thing was a fake.
SHERLOCK: Yes.
LESTRADE: Looked so promising.
SHERLOCK: Facile.
MOLLY: Why would someone go to all that trouble?
SHERLOCK (offscreen): Why indeed, John?

“GATISS: One of my favorite things is that amazing Orson Welles film, ‘F for Fake’ […] it’s fantastic, it’s all about the history of con tricks.

And in the beginning, he says, ‘I absolutely swear to you for the next ninety minutes everything I tell you will be absolute and literal truth.’

And then right towards the end of the film, it spirals into this extraordinary story about this con man that you can’t believe – and then he just sort of checks his watch and says, […] ‘My time is up, the last ten minutes I’ve been lying my head off!’ [laughs]

It’s brilliant … it’s really what we sort of do in miniature.
—
Mark Gatiss, on being asked about plot secrets.

“If we pull this off, it will make television history.” “It’s kind of groundbreaking, they’ve done something that’s never been done before”

additionally:

“An eminent scientist gets caught up in a highly damaging and compromising lie.”

“A doctor starts an affair with enigmatic stranger and begins to suspect more is at play”

“However, nothing is ever as it appears, and when she receives an unexpected proposition from an enigmatic stranger, Yvonne is shocked by the passion he awakens in her. But gradually she begins to realise that there is much more to her lover than meets the eye, and she could be playing a very dangerous game indeed.”

like seriously though (I know those are real people and real names, but… just so funny :D)

and:

(trailer after tfp)

https://m.youtube.com/watch?v=cM4c5wJF3Dk

The dialogue included:
“Can be wonderful, can be terrifying.”
“What did you say?”
“Something that drives you in and crushes you to nothing.”
“We are going to have different versions of the same story.”
“Do you want to hear the wildest story of them all?”
“You’re starting to intrigue me.”
“It’s all just one big performance.”
“We are going to be busy, you and I”

One more miracle!

“Of course it’s not a trick, it’s a plan.”