Constance Marten and Mark Gordon found in Brighton

A huge search continues to find their baby, who has not had any medical attention since birth in early January.

The couple were seen in Colchester just two days after they went missing from Bolton on January 5.

CCTV footage circulated by the police also suggested she had been at Harwich International Port on the same day at 9am.

Aristocrat - Constance Marten is from a wealthy aristocratic family (Image: Greater Manchester Police)

Ms Marten, who was wrapped in a large red scarf, was then believed to have been seen in Colchester about an hour later.

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

Detectives continued scouring a large area between Brighton and Newhaven to try to find the infant last night.

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.

Spotted - Constance Marten in Harwich International Port (Image: Greater Manchester Police)

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

The couple travelled from Bolton to Liverpool, then to Harwich and Colchester, then to east London and then to Newhaven in Sussex.

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.

Arrested - Mark Gordon has been arrested alongside Miss Marten (Image: Greater Manchester Police)

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.

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.”