Speaking to RadioTimes.com and other media at a recent press event, Roberts was sworn to secrecy on exactly what Kit’s big secret is. But he did explain that Mick has a hold over Kit that prevents the latter from holding him to account!
Is Kit scared of the knowledge that Mick has over him?
“I [wouldn’t] say he was scared,” mused the actor. “He knows it’s blackmail, he knows he’s gonna blackmail him. It is a past that he doesn’t want to bring up again.
“I suppose it’s… in real life, it’s where you have friends back in the day that you’d never want to meet any of your friends today; you don’t want them to tell stories of what happened back in the day, you sort of want to keep that stuff secret.”

Roberts added that Kit can only be pushed so far: “He knows he’s got something on him, and I think if he blackmails him too much, he’ll react back. I think that’s what’ll happen with Kit – he’ll only take [so] much.”
Expanding on the moment Kit steps in for Mick, the star delved into Kit’s complex mindset on the matter.