Hello. It looks like you�re using an ad blocker that may prevent our website from working properly. To receive the best Tortoise experience possible, please make sure any blockers are switched off and refresh the page.

If you have any questions or need help, let us know at memberhelp@tortoisemedia.com

The gender pay gap bot

The gender pay gap bot


On International Women’s Day, a Twitter bot drew attention to the gender pay gap in Britain’s biggest companies. But does the data they report tell the full story?

On International Women’s Day, an account went viral on Twitter. 

But instead of being run by a human, the account – called the Gender Pay Gap Bot – was programmed to automatically call companies out for their gender pay gaps.

That’s the difference between the amount paid to the average woman and the average man. 

Since 2017, companies with more than 250 employees are required to report theirs to the government. 

So every time one tweeted with the hashtag International Women’s Day, the account immediately responded with that publicly available information.

Throughout the day, the tweets from the bot picked up a lot of attention. 

Companies suddenly found themselves under intense scrutiny for the scale of their pay gaps. Some even deleted their tweets or reposted with different hashtags to avoid the bot.  

Francesca Lawson is co-creator of the Gender Pay Gap Bot.

“So what we wanted to do is put that data back under the spotlight and use it as a way of challenging some of the messages of empowerment, support, celebration, that companies put out on international women’s day because it’s no use empowering women one day when you are systematically discriminating against them for the other 364.”

Francesca Lawson

It meant companies trying to show their public support for women were quickly brought down to earth if they weren’t walking the walk themselves.


The Gender Pay Gap Bot is a good example of why it’s useful to have rules that require companies to publish pay gap data.

For progress to be made on paying employees fairly regardless of their gender, ethnicity or sexual orientation – companies need to feel the pressure and transparency is key. 

But when Tortoise took a closer look at the numbers, we came across a problem.

And it’s a pretty big one. 

This is Kim Darrah, a data reporter at Tortoise

“So we found that – when you try to hunt down a figure for the pay gap at some of the biggest companies in the country – the data is patchy and incomplete. And even if you do find a figure, it’s not always what you think it is.”  

Kim Darrah, Tortoise

Now it’s worth mentioning here exactly how the rules work. Companies are only required to send pay gap data to the government if they have over 250 employees in the UK. 

They have to do this by the 4th of April every year.

That should mean we can at least keep track of the pay gaps at big companies with the most employees. But the reality is much murkier. 

Take the supermarket Tesco, for example. You might think Tesco would publish one pay gap covering all of its UK-based employees, but instead it does something much more confusing. 

Tesco publishes twelve different pay gaps, each covering a separate individual subsiduary. 

This is because Tesco – like many big companies – is not just one entity. It’s a group of many businesses – all owned by the umbrella company Tesco plc.

So there’s Tesco Bank, Tesco Stores, One Stop Stores, Tesco Family Dining Ltd, Oakwood Distribution, Tesco Maintenance, Tesco Underwriting, Booker, Makro Self Service Wholesalers, Booker Retail Partners,  Ritter Courivaud, and dunnhumby. 

Under the rules, each one of these must publish their pay gaps, but Tesco PLC doesn’t need to.

So it doesn’t.

This makes life difficult for the Gender Pay Gap Bot and it also makes life difficult for anyone trying to make comparisons based on the data.

“Tesco wasn’t the only example. When you look at the figures on the government website, there’s no way to know exactly what you’re looking at without going really deep into the data.” 

Kim Darrah, Tortoise

Like the International Hotels Group, which runs 16 hotel brands including Holiday Inn. 

They do publish a gender pay gap report on their website that covers all of its roughly fourteen hundred UK employees.

But because its workforce is split across multiple different companies – and only two of them have more than 250 employees – the data the Group reports to the government only covers 679 – or 48 per cent – of its employees. That leaves a big hole in the data.

Looking at the FTSE 100 – Britain’s one hundred biggest businesses that you can buy shares in – we found 37 don’t publish a gender pay gap for their full UK workforce. 

That’s potentially thousands of employees whose pay isn’t being shared with the government, or the public. 

A handful of these companies had less than 250 employees based in the UK, so aren’t required to publish any data.

But more often it was because of their complex business structure of subsidiaries and holding companies, meaning they didn’t have to publish data for their full UK-based workforce in one go.


Not every business does this though, some are more transparent.

“Most of the FTSE voluntarily publish their UK-wide gender pay gaps – even if they had lots of subsidiaries. But that’s the important thing, it’s voluntary.” 

Kim Darrah, Tortoise

So why are some companies getting away without publishing the full figures?


When the rules were being created in 2016, several businesses raised these loopholes that mean companies don’t legally have to report their gender pay gaps at group level. 

One was British Telecom, or BT. It suggested they should be required to publish both at the group level and at the subsidiary level to avoid parts of the business being missed out. 

But the concerns were dismissed without any clear explanation. Instead, the government said that group-wide companies would be encouraged to report on a voluntary basis.

So –  five years on from the government making gender pay gap reporting a legal requirement, the data still isn’t capturing employees at some of the UK’s biggest companies. 

Today’s episode was written by Kim Darrah, Katie Riley and Phoebe Davis and mixed by Imy Harper.