Police say they're carrying out 'extensive enquiries' to find missing North Herts man William Taylor.
70-year-old Mr Taylor, whose birthday was on Monday, was last seen at his home in Gosmore near Hitchin at around 9pm on June the 3rd.
Detectives say they're increasingly worried about William - also known as Bill - and are appealing for anyone who might have seen him to get in touch.
His son Richard Taylor has made the following appeal: "If anyone out there knows anything about my dad's whereabouts please contact the police. This is an unbearable situation and I am worried sick about him. My family is in turmoil and we are desperate to get him home."
Detective Inspector Mike Keane, from the North Herts Local Crime Unit, said: "We are carrying out extensive enquiries to find William Taylor. His family are incredibly worried and I am appealing to anyone who might have seen William or has information on his whereabouts to get in touch.
We're growing increasingly concerned for his welfare, so any information you have, no matter how small it might seem, could be vital in us finding William".
:: William is described as being white, around 5ft 11in tall, of medium build with short grey hair.
:: He was last seen wearing a baby blue shirt, jeans and black wellies.
:: William may be wearing a navy blue boiler suit.
If you have seen him since he went missing or have information about his whereabouts please contact Hertfordshire Constabulary via the non-emergency number 101.
If you believe you are with William or have seen him in the last few moments please call 999.