The man claiming to be from "the water board" arrived at the home of an 84-year-old woman on Friday at around 8.40am.

Once inside he looked in cupboards, but it is not clear whether he checked the woman's meter. Nothing was stolen.

The man is described as white, between 5ft 10ins and 6ft tall, slim and aged between 30 and 40. He was wearing a smart brown shirt and dark trousers and was not carrying any identification.

Officers investigating the incident would like to hear from anyone who saw any suspicious activity in the Butts on Friday or has any other information.

Anyone with information is asked to contact Warwick police station on 415000 or can contact Crimestoppers anonymously on 0800 555 111.

*A Warwickshire Police spokeswoman said householders should not let anyone into their homes unless they know who they are or are bona fide company representatives.

She said: The spokeswoman said: "You do not have to let a stranger into your home - even if they claim it is an emergency."

The spokeswoman reminded residents of the doorstep code.

*Always put the security chain on the door before opening it.

*Ask the caller who they are and where they are from.

*Ask to see identification papers - take their card and examine it closely.

*Check with the company they claim to represent using a number from the telephone directory, not the number on the card.

*If you have any doubts make an appointment for the caller to come back when you will be able to have a friend or relative with you. Genuine callers will understand and will be happy to comply with these arrangements.