Does anyone have any behind the scenes gossip?

Doctor Who on the surface has always been one of those shows that has been quite drama free, so I was just wondering whether anyone has any behind the scenes gossip they've heard about in person or online?

This is rather common knowledge but my mate got talking to someone at one of the comic con's who had a behind the scenes role for series 1 and 2, and he went in to a good amount of detail about why Eccleston left during s1 - (pretty sure everyone knows this already) but apparently series 1 was a very badly run production - they were almost always behind schedule, major issues with directors, stunts were being performed that were way too dangerous, heavy rewrites were happening on set, and a lot of footage was being deemed "unusable" - apparently Piper didn't care as much as it was one of her first productions so she didn't know much different, but as everyone knows since Eccleston was a much more seasoned actor, he was incredibly unhappy with how the show was being run.

But the sad thing is, according to this person my mate was talking to, Eccleston still did genuinely enjoy doing the show regardless of the production issues, his main issues came from RTD, Julie Gardner and Phil Collinson. Whilst they weren't directly involved in some of the issues, for Eccleston their inability to take any responsibility, sweep everything under the rug, and back each other up as if they were in some sort of clique was the big issue - and it wasn't just Eccleston who wasn't having a great time - some of the production staff who had smaller roles also felt that RTD, Gardner, and Collinson were all in over their heads and the show lacked a true sense of authority who knew what they were actually doing.

But it was mainly RTD, Julie Gardner's and Phil Collinson's reaction to his criticism and the show's issues that led Eccleston to leaving. He understood that they were probably struggling a bit with it being their first major series and he was apparently very sympathetic and understanding of that, what forced him to leave was the arrogance, their lack of accountability, and the decision not to do anything about the issues at the time.

Things did improve vastly for series 2 though after a few warnings and help from the BBC, but by that time Eccleston had unfortunately lost all respect for RTD, Gardner, and Collinson, so the damage was done.

The guy my mate was talking to how he does unfortunately still hear some not so great stories today - not as bad as the s1 stuff, but just how some lower production staff do feel as if Doctor Who is still being run by a bit of a clique (RTD, Gardener, and Collinson at the centre) where RTD has essentially surrounded himself with yes-men.

But hey, I'm pretty sure that stuff is already widely known - does anyone else have any behind the scenes gossip they could share?

I also heard about something going on during the set of The Caretaker between Capaldi and Gareth Roberts…