BBC boss Tim Davie has apologised over the alleged abusive behaviour on Strictly - and issued a stern warning to stars. Breaking his silence on the scandal surrounding Giovanni Pernice and Graziano Di Prima , the Director General of the channel said: "The line should never be crossed". 4 Tim Davie broke his silence on scandal-hit Strictly Come Dancing Credit: Alamy 4 Strictly's professional dancers have begun training for the new series Credit: Instagram 4 Hosts Claudia Winkleman and Tess Daly are back for the 20th series Credit: PA Admitting he was "disappointed" by the complaints, he added: "I’m very sorry that anyone has had an experience on Strictly that hasn’t been wholly positive.

" Tim was speaking on the BBC's annual report day as he delivered a speech on the future of the corporation and revealed Gary Lineker and Zoe Ball remain the channel's highest-earning stars . "I do want to say something on Strictly, which is obviously in the headlines," Tim said. "Strictly is a wonderful show that brings a lot of joy to a lot of people and has done so for 20 years to both those involved with the show and to the millions of people at home.

"Hundreds of people, be they pros, contestants or crew have been part of it and had a brilliant experience. "At the same time if someone thinks there was something wrong or they want to talk about their experience then of course we want them to raise that with us. Be in no doubt we will take it seriously, listen and deal with it as appropr.