The woman’s estranged father went missing with his sex offender partner and their newborn child begged her to go to the police.

Constance Marten, Mark Gordon and their baby have been missing for 12 days, prompting a police search.

Gordon went to prison in the late 1980s Florida after raping and assaulting a woman when he was 14. After serving a 20-year sentence, he was deported back to the UK in 2010.

Napier Martin, an aristocratic film and music producer with ties to the royal family, told his daughter in a message that she was “very much loved” and needed to find safety.

Police have been searching for the pair since their car broke down and burst into flames on the M61 near Farnworth, Bolton, January 5. Police believe the baby may have been born in the car and was less than two days old.

Sending a message to his daughter in an interview with independentNapier Martin, 63, said: “I want you to know that you are very much loved, no matter what the circumstances. We are deeply concerned for your well-being and the well-being of your child.’

Constance Marten was a drama student when she met Gordon in 2016 and led an increasingly isolated life with him, cutting ties with family and friends.

Napier Martin, 63, who said he had known about Gordon’s criminal record for some time, said: “The last eight years have been more painful for the whole family and for your friends as they must have been for you. And to see you so vulnerable again is a tremendous challenge.”

Police said neither she nor her baby had received medical care since birth. The pair are believed to have been carrying a significant amount of cash, allowing them to evade authorities. They have been seen in Essex, Kent and London.

Addressing her, Napier Martin said: “Dear Constance, even though we remain strangers for the time being, I stand by, as I always have and as the family has always done, to do everything necessary for your safe return to us.

“I am asking you to find a way to turn yourself and your little one over to the police as soon as possible so that you and he or she can be protected. Only then can the recovery process begin, no matter how long it may be, no matter how difficult it may be.

“I want you to understand that the family will do whatever is necessary for your well-being.”

Constance Marten grew up on the Dorset estate of Critchell House. Her grandmother was a playmate of Princess Margaret and her father was once a pageboy to Queen Elizabeth II.

Napier Marten added: “I would like to thank the police for all their efforts in bringing this tragic episode to a swift and safe conclusion and I urge you, Constance, to please find the courage to come forward to the police as soon as possible.”

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