Some of the BBC's most high-profile female personalities are preparing to revolt if their demands to tackle the gender pay gap are not met.
Household names including presenters Clare Balding, Victoria Derbyshire and Angela Rippon are among more than 40 women to have signed a frank open letter to Director-General Tony Hall, urging him to "correct this disparity" over gender pay, which they say has been known within the corporation "for years".
One Show host Alex Jones, Antiques Roadshow's Fiona Bruce and Newsnight presenter Emily Maitlis have also added their backing to sorting out pay inequality "now", rather than by Lord Hall's self-imposed 2020 timescale.
It comes after documents setting out the pay for staff on more than £150,000 showed a sizeable gap in the earnings of the corporation's best-known male and female presenters and actors, with Radio 2 presenter Chris Evans topping the list on more than £2 million, while the highest paid woman was Strictly's Claudia Winkleman on between £450,000-£499,999.
In the letter, the signatories say they will be "prepared to meet" Mr Hall "so that future generations of women do not face this kind of discrimination".
It reads: "The pay details released in the Annual report showed what many of us have suspected for many years ... that women at the BBC are being paid less than men for the same work.
"Compared to many women and men, we are very well compensated and fortunate. However, this is an age of equality and the BBC is an organisation that prides itself on its values.
"You have said that you will 'sort' the gender pay gap by 2020, but the BBC has known about the pay disparity for years.
"We all want to go on the record to call upon you to act now."
Women's Hour host Jane Garvey, who coordinated the letter, Tweeted on Saturday night: "Revolting."
Wimbledon presenter Sue Barker, Today programme journalists Mishal Husain and Sarah Montague and BBC Breakfast regular Sally Nugent are among those to have also added their names to the list.
The letter adds: "Beyond the list, there are so many other areas including production, engineering and support services and global, regional and local media where a pay gap has languished for too long.
"This is an opportunity for those of us with strong and loud voices to use them on behalf of all, and for an organisation that had to be pushed into transparency to do the right thing.
"We would be willing to meet you to discuss ways in which you can correct this disparity so that future generations of women do not face this kind of discrimination."
Speaking at the launch of the annual report, Lord Hall said there was "more to do" on how the licence fee was spent.
He said: "At the moment, of the talent earning over £150,000, two thirds are men and one third are women.
"Is that where we want to be? No. Are we pushing further and faster than any other major broadcaster? Most certainly.
"We've already set a clear and strong target for what we want to achieve by 2020: we want all our lead and presenting roles to be equally divided by men and women.
"This is already having an impact - of the top talent we have hired or promoted in the last three years, more than 60% are women."
A BBC spokesman said: "We have made significant changes over the last three years but need to do more. Tony Hall has pledged the BBC will go further faster.
"Across the BBC, the average pay of men is 10% higher than women. The national average is 18%.
"We are committing to closing it by 2020 - something no other organisation has committed to doing.
"The BBC's workforce has been hired over generations and this is complex and cannot be done overnight.
"We are, however, confident that when these figures are published again next year they will show significant progress towards that goal.
"Tony Hall meets staff all the time and will of course meet individuals to hear their thoughts as we work to accelerate change."
Theresa May responded to the report by calling for women and men to be paid equally.
She said: "Lord Hall has said that he wants to change this. He wants to make progress. He wants to abolish this gender pay gap.
"We want to see him doing that too. And I think it's important the BBC carries on publishing figures in the future so that we can see the progress that they're making."
Presenter Andrew Marr, who is paid up to £449,999, said he received a high salary because he had been around for a long time.
Speaking on his Sunday morning show, he said: "People like me, I have been around for a long time, we get paid more because we have got experience.
"I'm a bit grizzled, going a bit weird around the edges.
"But if I had been born Audrey Marr rather than Andrew Marr, I would have been out ten years ago.
"There's a real lack of older women on the screen."
During a newspaper review discussion on a planned shake-up of transgender rights, he said: "If I decided I was going to declare myself a woman, I could retire early."
Tory former minister Anna Soubry, a former television presenter, said she kept a "very beady eye" on pay levels when she was a mother of the chapel at a branch of the National Union of Journalists.
"I just wonder whether or not the de-unionisation of many places of work... they played an important point in making sure there was fairness," she told BBC One's The Andrew Marr Show.
Labour leader Jeremy Corbyn said he would "sign the letter with them" and called on the BBC to "look very hard at itself".
He told BBC One's The Andrew Marr Show: "This gender pay gap is appalling. We would insist on a strong pay audit of every organisation and we'd also look at a 20-1 ratio between the chief executive and the lowest paid staff in every public sector organisation."