Officers have received reports of incidents in the Norwich, Blakeney, Great Yarmouth, Horning, Poringland and Costessey areas. In each case a man has knocked at the door claiming to be there to either read a gas or electricity meter, or to check the boiler.

　Police are reminding householders to be vigilant when dealing with cold callers and offer the following advice:

　Close and lock the back door before answering the front door.

• Use a spy hole or window to look at the caller before answering the door.
• If you do not recognise the caller, speak to them through the closed door.
• If the caller is selling something or offering work on your home, tell them you are not interested and ask them to leave.
• If they do not leave or you need assistance- call the police.
• If the caller is valid, always ask for proof of identity.　Phone the company or organisation the caller claims to be from while the caller waits outside.
• Tell someone you trust about the uninvited callers to your home.
• If necessary, report it to police with a description of the people involved and details of their vehicle if possible.

To report suspicious activity call Norfolk Constabulary on　101. In an emergency always dial 999.