The former commissioner of the Metropolitan Police who befriended Mohamed Al-Fayed has revealed the billionaire once gifted him a Viagra pill.

Lord Stevens, who met Mr Al-Fayed during the inquiry into the deaths of Princess Diana and Dodi Fayed, described him as ‘a character’.

Speaking in episode three of Investigating Diana: Death in Paris, Lord Stevens recalled walking into Mr Al-Fayed’s department store Harrods to have meetings about the progress of the inquiry, called Operation Paget, in a room above the store.

Mohammed Al-Fayed gave VIAGRA and BULL’S TESTICLES to Lord Stevens

And as he continued to visit Mr Al-Fayed, Lord Stevens revealed some of the strange gifts the billionaire gave to him.

‘On one occasion he gave me a Viagra. He said “this will help your love life”,’ he recalled.

The former top cop added: ‘I didn’t need any help with my sex life as it happened.’

Lord Stevens said that about three weeks later, Mr Al-Fayed gave him ‘a bull’s testicle’.

He recalled: ‘It’s quite a strange thing to do, really.’

Lord Stevens added they kept ‘no secrets’ from the Egyptian tycoon while the investigation was underway and the team constantly updated him with their progress.

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Lord Stevens, who was the commissioner of the Metropolitan Police from 2000 until 2005, revealed the odd gifts he received from Mohamed Al-Fayed

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Mr Al-Fayed and Princess Diana struck up a friendship after she grew close to the billionaire’s son, Dodi Fayed

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Dodi Fayed and Princess Diana were pictured together on holiday in St Tropez in August 1997, shortly before the fatal car crash in Paris

He said: ‘There was absolutely no point in trying to keep anything away from him.

‘It was my job to take him through what progress we were making and where the evidence was taking us.’

The former top cop was asked to lead Operation Paget by the Royal Coroner in 2004 to investigate conspiracy theories surrounding the Paris car crash in 1997.

David Douglas, senior investigating officer on Operation Paget, said that every meeting with Mr Al-Fayed began the same way.

He recalled: ‘Mr Al-Fayed would just walk into the room; reinforce his view that his son was murdered and so was the Princess of Wales. Lord Stevens listened.’

In particular, the Queen’s Coroner asked Lord Stevens to investigate allegations that MI6 had conspired with the Royal Family to deliberately cause the fatal accident.

The second episode of the Channel 4 documentary series examined Mr Al-Fayed’s strong belief that Princess Diana and his son Dodi were ‘assassinated’.

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David Douglas, the senior investigating officer on Operation Paget, said Mr Al-Fayed would enter every single meeting reasserting his belief that Princess Diana and Dodi were murdered

As the French authorities opened an official investigation into their deaths, billionaire Al-Fayed hired his own team of private investigators in pursuit of his theory.

Despite the grieving father’s strongly held belief, one member of his team insisted to the programme that the aim was to remain ‘objective’.

Michel Kerbois said: ‘I wasn’t working against [the French authorities]. I was working for the truth.’

Speaking in the third episode Lord John Stevens said he personally had been asked to lead the Operation Paget inquiry, which was ‘unprecedented’.

He said: ‘The allegation is that the most popular woman in the world has been murdered by the Queen’s husband together with MI6.

‘That’s very serious stuff.’

He added it was ‘obvious’ that 85% of the British population believed there was a conspiracy of some kind – including members of Lord Stevens’ own family.

He said: ‘At the end of the day we had to get to the bottom of what went on here.’