A £10,000 reward is being offered in the search for missing aristocrat Constance Marten, her newborn baby and her convicted sex offender partner.
The couple and their baby were last seen in Newhaven, East Sussex, on January 9, the Metropolitan Police said, but they believe the family are still in the UK.
They are believed to have been sleeping rough after buying camping equipment from a branch of Argos in east London on January 7.