L'Wren Scott and MickJagger in 2004. Photo: Ian West/PA WireL'Wren Scott and MickJagger in 2004. Photo: Ian West/PA Wire

A multimillion-pound legal battle is reportedly under way between the Rolling Stones and insurance underwriters over costs incurred after the cancellation of concerts following the death of Sir Mick Jagger’s girlfriend L’Wren Scott.

Sir Mick suffered “acute traumatic stress disorder” after Scott’s suicide earlier this year, court documents filed in the fashion designer’s home state of Utah claim.

The Stones are said to have taken out a £15 million insurance policy in the event of any shows being cancelled due to the death of family members.

Scott was one of 18 people on Sir Mick’s “named persons extension list”, published by the Salt Lake Tribune news site.

The group postponed their concert tour of Australia and New Zealand after her death and filed an £8 million claim for losses.

The Tribune reported that court documents claim Sir Mick was advised not to perform for at least 30 days after his 49-year-old girlfriend was found dead in her New York apartment in March.

But it said insurance underwriters have denied the claim on the basis that Scott might have been suffering from a mental illness, meaning her death may not be covered by the policy.

The underwriters have been granted permission to gather evidence about possible illnesses, treatments and the circumstances of Scott’s death from her brother Randall Bambrough, the Tribune said.

The underwriters are also said to have asked a court in New York for permission to seek similar information from Miss Scott’s former personal assistant and the executor of her estate.

The band is reported to have sued the underwriters in London.

Scott had been in a relationship with Sir Mick for 13 years and was a red carpet favourite, with her dresses worn by Hollywood stars including Nicole Kidman and Penélope Cruz. But she reportedly owed nearly £4.6 million to creditors at the time of her death.

At the weekend the Rolling Stones were forced to cancel a performance in Melbourne, during their latest tour which includes a number of dates rescheduled after Scott’s death. The promoter for the tour said Sir Mick was “under strict doctor’s orders to rest his vocal cords for the next few days in order to recuperate for the remainder of the tour”.

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