Detectives investigating a sexual assault on a woman travelling on a train between Lincoln and Gainsborough have released a CCTV image of a man they believe could hold vital information.
He boarded a train with friends shortly before 7.30pm on Saturday, November 30, and sat next to a female at a table.
Call British Transport Police on 0800 405040 and quote reference 655 of 30/11/19.
