The final figures for the gender pay gap at Britain's largest companies have been revealed after the deadline for submissions passed at midnight on Wednesday.
Of the 10,015 firms to have reported their figures, 78pc have a pay gap in favour of men. The median pay gap among those companies was 9.7pc.
The remaining employers either have no median gender pay (8pc) or one in favour of women (14pc).
Last night saw hundreds of businesses in a last-minute rush to file their information before the midnight deadline. More than 15pc of businesses that reported their findings sent them between Tuesday 4pm and the cut-off point.
Budget airline Ryanair and holding company Millwall FC were found to be in the top 10 worst offenders list, with a gap of 71.8pc and 80pc respectively.
The carrier said the disparity was because it employs 546 male pilots and just eight female pilots.
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British businesses have been required to submit their data on mean and median gender pay gaps after the Government introduced legislation requiring all UK companies employing at least 250 people to publish statistics revealing their gender pay gap, or lack thereof. The deadline was March 30 for public sector employers and April 4 for private and voluntary sector employers.
Companies who fail to provide data face legal action, including court orders and fines, but only after they have been given a month's grace to report the figures.
The Equality and Human Rights Commission (EHRC) will write to employers who have not complied on April 9, giving them 28 days to publish the figures "before an investigation takes place and an unlawful act notice is issued".
Rebecca Hilsenrath, chief executive of the EHRC, said: "This is not optional; it is the law and we will be fully enforcing against all companies that do not report."
The published figures show that women's fashion and beauty brands are some of the worst offenders in the gender pay gap league tables.
High street brands Karen Millen, Phase Eight and Sweaty Betty are among the worst 2pc of all companies in paying women lower hourly wages. Meanwhile, the Body Shop has one of the highest pay gaps for bonuses – the median amount given to women was 85.7pc lower than what men received.
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Sam Smethers, chief executive of the Fawcett Society, said: "Gender pay gap reporting is a game changer in terms of workplace culture and practices. It forces employers to look at themselves and understand their organisations and it prompts employees to ask some hard questions.