Tony Blair’s company is alleged to have brokered multi-million pound deals that earned £41,000 a month and two per cent commission on each transaction with an oil firm founded by a senior Saudi royal family member.

The leaked 21-page contract apparently shows that the former Labour prime minister's umbrella company, Tony Blair Associates, agreed in November 2010 to arrange deals for PetroSaudi with his senior Chinese officials contacts during his visit to Beijing that month, as reported by The Sunday Times.

This is the first time that a commercial contract of his has apparently been revealed, despite the petrol firm insisting it stays top secret, and it poses questions over Blair's role as a Middle East envoy and his vested personal interests following his decision to invade Iraq in 2003.

Tony Blair: A career of controversies Show all 11 1 /11 Tony Blair: A career of controversies Tony Blair: A career of controversies The Tony Blair 'selfie'.. A journalist takes a picture of Kennard Phillips 'Photo Op', depicting Prime Minister Tony Blair taking a 'selfie' in front of an explosion in Iraq, during a press viewing of the exhibition Catalyst: Contemporary Art and War Tony Blair: A career of controversies Protesters pictured outside the QEII Conference centre in London in 2011 as former British PM Tony Blair give his evidence in the Chilcot Iraq Inquiry Tony Blair: A career of controversies David Lawley-Wakelin, who disrupted Tony Blair’s testimony at the Leveson Inquiry by bursting into the court Tony Blair: A career of controversies Blair giving evidence Tony Blair: A career of controversies Tony Blair visiting troops in Iraq in 2007 Tony Blair: A career of controversies Blair meeting with troops in Basra, Iraq in 2003 Tony Blair: A career of controversies Britain's Prime Minister Tony Blair speaks to British soldiers at Divisional Headquaters in Basra, May 2007 Tony Blair: A career of controversies British Prime Minister Tony Blair eats dinner with British troops in Basra, Iraq, 21 December, 2004 Tony Blair: A career of controversies Syrian president Bashar El Assad during his official visit to the United Kingdom in 2002. Mr Blair tried to engage Mr Garcia in a conversation about Syria. The former Prime Minister made clear he was very much in favour of military intervention last summer. Tony Blair: A career of controversies Syrian president Bashar El Assad and wife Asma during their official visit to the United Kingdom in 2002. Mr Blair tried to engage Mr Garcia in a conversation about Syria Tony Blair: A career of controversies Former Prime Minister Tony Blair's signature adorns a program he signed for an Iraq veteran during a reception at the Guildhall in London following the service of commemoration at St Paul's Cathedral honouring UK military and civilian personnel who served in Iraq

PetroSaudi, which is registered in the Cayman Islands tax-haven to legally avoid 85 per cent oil and gas company taxes in the Middle Eastern nation, was jointly founded by Saudi businessman Tarek Obaid and Prince Turki bin Abdullah Al Saud, one of Saudi Arabia's King Abdullah's seven sons.

The contract appears to state that TBA would help find potential new investment donors and says that they would make "introductions to the senior political leadership, industrial policy-makers, corporate entities and other persons in China identified and deemed by us and you to be relevant to PetroSaudi's international strategy," the Sunday Times added.

A spokesperson said: "Tony Blair Associates worked for PetroSaudi for a period of months over four years ago.

"This was in connection with an issue in the Far East and nothing whatsoever to do with the Middle East or the unpaid ex-officio role of Tony Blair for the Quartet in Palestine.

However, the Sunday Times reported that chief investment officer of PetroSaudi, Patrick Mahoney, claimed that Blair worked on the Saudi Arabian deal "for about four to five months maximum."

The UK arm of the oil firm is registered in Mayfair, London, and the whole operation has projects in Ghana, Indonesia, Venuzuela and Tunisia with an alleged £1.1 billion investment from Malaysian government firm 1MDB.