The Guardian leads with the gender pay gap story, external on its front page. It quotes Institute for Fiscal Studies findings that women now earn 18% less on average than men.

Sam Smethers, chief executive of the Fawcett Society, a women's rights charity, tells the newspaper that women's skills are being wasted in part-time roles after childbirth.

But Mark Littlewood of the Institute of Economic Affairs, a free-market think tank, says the report shows companies are not discriminating against women. "As the study itself notes, women who take time off work, then return doing fewer hours, are not getting paid less per hour," he says. 

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So how can women not be disadvantaged if they choose to have children? Anne Francke of CMI says: "The factors are cultural. What companies should be looking for are outputs, not face-time - so the old adage of the first in the office and the last to leave is... somehow doing a better job - that's a myth. What we need to look at is: what are people actually achieving, what is their actual productivity? And we know that flexible workers are more productive."

Rank, the casino and bingo chain which abandoned a tie-up with the UK's biggest bookmaker William Hill last week, has reported a 15% jump in pre-tax profit, external to £85.5m in the year to the end of June. Revenue increased 2% to £753m.

The company did not comment on the failed bid for William Hill, which it had mounted with online operator 888. 

Rank said it expected "little or no impact" from the Brexit vote, but added: "Any likely impact would however be driven by any macro-economic impact of lower UK growth rates or loss of consumer confidence and spending power."

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Persimmon, one of the UK's largest housebuilders, has said that customer interest in its houses has remained "robust" after the UK referendum.

Chief executive Jeff Fairburn said, external: "While the result of the EU referendum has created increased economic uncertainty, customer interest since then has been robust with visitor numbers to our sites around 20% ahead year on year. Our private sale reservation rate since 1 July is currently 17% ahead of the same period last year. The group is now trading through the traditionally slower summer weeks but customer demand remains encouraging and we anticipate a good autumn sales season."

The housebuilder reported a 29% jump in pre-tax profits to £352.3m in the six months to 30 June.

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Image source, The Woodford Fund

Neil Woodford, one of the UK's most respected investors, has scrapped bonuses at his firm, arguing that they are "largely ineffective" in boosting performance.  

Colin McLean of SVM Asset Management says there are "certainly arguments" that bonuses "don't incentivise or motivate workers particularly well". However, he is going to balance this out by increasing basic pay, Mr McLean says. "The ability to have bonuses allows overall pay to drop a bit at adverse times in the cycle, so he may lose a bit of flexibility by doing this."

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The oil price is pushing lower in Asian trading - Brent crude is down more than 1% to around $48.65 a barrel, after having dropped back below $50 on Monday.

Colin McLean, chief executive of SVM Asset Management, says the price fall is partly because US rigs are rising in number again. Technological advances mean they can operate at lower cost.

"It's becoming economic for them to restart again," he tells Wake Up to Money. "I think that's keeping a lid on the price."

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Adding to the debate on the gender wage gap is research from the Chartered Management Institute (CMI), which suggests that men are more likely than women to have been promoted into senior roles in the last year. Its analysis of more than 60,000 UK employees found that 14% of men in management roles were promoted into higher positions, but only 10% of women.

Anne Francke, chief executive of CMI, says: "Men are more likely than women to put themselves forward for promotion on a regular basis, and be harder and tougher about pay negotiations." 

Many women have taken maternity leave and have come back into the workplace, "and people assume that they're not up for challenging roles, which of course is simply not the case", she adds.

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The sale of UK arms to Saudi Arabia for use in Yemen puts Britain in violation of the international Arms Trade Treaty, Oxfam will say at a meeting of treaty signatories later.

The BBC's Imogen Foulkes in Geneva says that according to campaign groups including Amnesty International, Saudi Arabia is heavily involved in a vicious conflict in Yemen leading airstrikes in an attempt to support the failing government there.

"What the non-governmental organisations critical of Britain are saying is: you signed up to a treaty that said you wouldn't sell arms to countries involved in conflict where you believed international law might be being violated, where you believe human rights violations might be taking place... and that those questions do apply to Yemen."

Image source, AFP

Shares in Asia are little moved on Tuesday with the region's largest market, Japan's Nikkei 225, flat and Hong Kong's Hang Seng 0.3% lower. 

Elsewhere, the Chinese mainland Shanghai Composite was up 0.3% while South Korea's Kospi also edged 0.3% higher.

In Australia, the ASX 200 saw the region's biggest gains with 0.8%. 

Business Live on the BBC News channel will be looking at the gender pay gap from 08:30...

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A new report says the wage gap between men and women becomes steadily wider in the years after women return to work part-time after having a baby. 

The Institute for Fiscal Studies suggests that's because of a lack of subsequent promotions and because they accrue less experience due to working fewer hours.

Robert Joyce, one of the report's authors, says: "Women who work part-time, and of course many women do switch to that form of work after childbirth, don't pay an immediate price in terms of their hourly pay. 

"It doesn't immediately fall at that point, but wage progression does seem to be shut down. So they seem to fall further and further behind their male or full-time female counterparts."

Welcome to another day of Business Live. 

We'll have results from one of the UK's biggest housebuilders, Persimmon, this morning. 

Later on we'll have supermarket market share figures, when we'll see if Asda has slipped further - it reported a steep sales decline last week. 

Stay with us and we'll keep you up to date with all the latest business news.