A huge search is taking place to find the baby of aristocrat Constance Marten and her partner Mark Gordon who went missing near Bolton.

The two have been taken into police custody after being found in Brighton.

Officers are now scouring a large area between Brighton and Newhaven to try to find the infant, who has not had any medical attention since birth in early January.

The Metropolitan Police said the pair were located and arrested by officers from Sussex Police in Stanmer Villas, Brighton on Monday night after a member of the public reported seeing them shortly before 9.30pm.

Marten, 35, and Gordon, 48, have been travelling around the UK by taxi since their car was found burning on the M61 in Bolton, Greater Manchester, on January 5.

Authorities previously believed the couple had been sleeping rough in a blue tent, and had avoided being traced by the police by moving around frequently and keeping their faces covered in CCTV images.

The Bolton News: Constance Marten and Mark Gordon

The couple travelled from Bolton to Liverpool, then to Harwich in Essex, then to east London and then to Newhaven in Sussex, where they were seen near the ferry port on January 8.

Miss Marten, who is from a wealthy aristocratic family, was a promising drama student when she first met Mr Gordon in 2016.

Since then the couple have led an isolated life, and in September, when Miss Marten was well into her pregnancy, began moving around rental flats.

Gordon served 20 years in prison in the US for rape and battery committed when he was 14.

It is unknown if their baby was full-term or has any health issues.

The Bolton News: Last sighting - Constance Marten was last captured on CCTV at Harwich International Port

Senior investigating officer Detective Superintendent Lewis Basford told BBC Breakfast that officers from the Metropolitan and Sussex police forces are searching a huge area of land to try to find the infant.

The couple are known to have travelled long distances during the time they have been missing and the BBC reported they were seen in Newhaven a few days ago.

Mr Basford said: “It is a vast area and at present we are looking in the local vicinity to where the couple were arrested last night, seeking a shelter or location for where they may have been holed up and hopefully where the baby is present.

“The arrest location was close to open land and the couple were moving towards that land. And that’s why we are focusing heavily on where we are right now.

“We know that they travel, we know they travel long distances.

“My plea to the members of the public here in Brighton and crossing over towards Newhaven is please be vigilant in the open land where you are, in the outbuildings that you may have on your own property, and assist us in that way by being vigilant.”

In an appeal a week ago, Shereen Nimmo, director of midwifery for Barts Health NHS Trust, urged the couple to bring the baby in for checks.

She said: “You’re putting your baby at risk by not accessing medical care, so it’s really important that you come and see a midwife, doctor or another healthcare professional as soon as possible.

“Babies need a safe, warm environment and all new mums are given information about safe sleeping for their baby to prevent sudden infant death syndrome.

“Please do the right thing for your baby and go to your nearest healthcare facility so my caring colleagues can take care of you and your baby. All we want to do is help you.”

At the time, DS  Basford said around 50 officers were working on the case at any one time and more than 630 hours of CCTV had been viewed.

He said there had been more than 350 calls to police from the public with information following previous appeals.

A £10,000 reward had been on offer for information that led to them being found safe.

Anyone who may be able to assist in the search for the couple’s baby is urged to contact 999.