Police have warned Great Missenden residents to keep tabs on a man who has been knocking on doors asking to buy old jewellery.

The man is described as "persistent and very difficult when asked to leave" by officers who are investigating his activities.

Officers believe he is targeting the village's older residents and have asked anyone who is approached by him to get in contact.

The man is aged between 40 and 50, has grey hair that is wavy on top, and is about 6ft tall.

Anyone who comes into contact with him should contact police on 101 and quote crime reference number URN 1550 of 08/05/15.