Women working at the Royal Free Hospital, in Hampstead, are earning 17.7 per cent less per hour than men, figures have revealed.

Men at the hospital also receive higher bonuses than women who recieve on average 22.1pc less.

At the Whittington Hospital in Highgate woman are earning 10.6pc per hour less than men with male workers more likely to receive a bonus than women.

All organisations who employ more than 250 people had to report their gender pay gap, the difference between the average hourly rate they pay men and female eomployees, to the government by March 31.

Employers have also had to publish the gender split of their employees in four broad pay bands, as a large gender pay gap is sometimes explained by fewer women at the top end of the pay scale.

However, the NHS’ workforce is more than three-quarters female, so there are more women in every pay band.

The top group of earners at Royal Free London NHS Foundation trust is 62.4pc female, while in the lowest group 73pc of staff are women.

The gap between what male and female workers earn based on average hourly earnings for all workers in the UK in 2017 was 17.4pc.

A Whittington Health NHS Trust spokesperson said: “Our gender pay gap is largely driven by a small number of male administrative staff who receive proportionately high pay on an hourly basis. In a number of our staff groups – such as Nursing, Allied Health Professionals and Doctors in training – our female staff earn more per hour on average than our male staff. We also have more female consultants who have been successful in receiving Clinical Excellence Awards than male consultants.

“We already actively support women to return to work following maternity and adoption leave and offer flexible working arrangements. We are committed to tackling this issue and will be developing further actions to address this.“

A Royal Free Hospital spokesman said: “The Royal Free London supports a fair pay and reward system that recognises the valuable contribution of all staff irrespective of gender.

“We welcome the publication of these reports and believe that the extra focus on this area will help us to eliminate the gender pay gap altogether.

He added: We are proud of our record of promoting women in healthcare. The Royal Free Hospital was the first hospital in London to accept women medical students in 1887 and our trust board currently has more women members than men.”