The former PM now thinks he should have written to the Treasury over Greensill Capital, says a friend.
Sir Richard, one of the UK's richest men, was found dead and a woman hurt at his mansion in Dorset.
What happens next in the days leading up to the ceremonial funeral of the Duke of Edinburgh?
The Queen's "beloved" husband of 73 years, the longest-serving consort in British history, died at Windsor Castle on Friday morning.
Members of the public gather at Buckingham Palace to lay flowers and show support for the Queen.
Tony Mullins was among the first ever group to be awarded a gold Duke of Edinburgh Award in 1958.
He died peacefully on Friday morning at Windsor Castle.
Former Aeroflot director and Russian exile Nikolai Glushkov was unlawfully killed, a coroner rules.
'He's someone I look up to as a young person,' said one of the visitors paying their respects to HRH Prince Philip.
For pals James and Nathan, the awards are about more than hauling badly-packed rucksacks up hills.
A woman visiting Sandringham says Prince Philip was a "marvellous member of the Royal Family".
Tributes are paid to the Duke of Edinburgh following his death at the age of 99.
ONS estimates that one-in-350 people in the UK currently have coronavirus
Graham McGill, 59, was convicted of strangling mother-of-11 Mary McLaughlin in her Glasgow flat.
Customers say they are being "scammed" by private firms failing to deliver Covid test kits and results.
Tributes are paid to the Queen's "beloved" husband of 73 years, who had recently spent a month in hospital.
Flags at many civic buildings are flown at half-mast and Senedd election campaigning is suspended.
Members of the public gather at Buckingham Palace, where a notice announcing the death was placed.
Boris Johnson and Sir Keir Starmer lead the condolences, as parties suspend election campaigning.
A two-minute silence is held at Aintree as the sporting world pays tribute to Prince Philip, who has died aged 99.
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