Thames Valley Police has released CCTV footage as the search for missing man Roy Morris continues.
Roy, aged 60, has been missing since May 26, and was last seen leaving his address in Grove Hill, Chalfont St Peter, at around 6.45pm.
Investigating officers have now released new CCTV footage of Roy in Chalfont St Peter and Gerrards Cross on May 26.
The search has been widened to include areas of the Chalfonts, Hedgerley, Seer Green and the A40 towards Beaconsfield.
The footage, timed at approximately 6.50pm, shows Roy walking from his home in Grove Hill and then on to Lovell Road.
He is then seen walking on Nicol Road in the direction of Gold Hill East.
At the junction of Nicol Road and Gold Hill East, he is seen heading towards Austenwood Lane.
It is believed he then walked down Priory Road before taking a footpath in the direction of Gerrards Cross Bowling Club.
He is then known to have walked down Bull Lane to the junction with the A40 Oxford Road, where he turned right in the direction away from Gerrards Cross.
A moving image of Roy was picked up by a Thames Valley Police roads policing unit on the A40 at around 7.25pm.
The last known image of Roy was then captured just prior to the turning for Mumfords Lane at around 7.36pm.
Roy is known to frequent the River Misbourne walk, White Hart Pub, Chalfont, The Plough at Cadsden, Gerrards Cross, and local rural/woodland areas.
Superintendent Amy Clements, the Local Policing Area Commander for Chiltern & South Bucks, said: “Officers have been conducting widespread and thorough searches for Roy since he was reported missing.
“We are releasing these CCTV images and footage of Roy’s last known movements in the hope that they may jog someone’s memory that can help in our investigation to find him.
“Roy’s disappearance is out of character, and we are continuing to investigate the circumstances behind him going missing on May 26.
“As well as releasing these images, I am also making a direct appeal to Roy. Roy, you are not in any trouble whatsoever, but we, your family and your friends, are very concerned for your welfare.
“Please make contact with police, or your family. We just want to know that you are safe. If you have any worries or concerns, we and your family are here to support you and help you.
“If anyone has any information that can help us to local Roy, please call 101, quoting the URN 1114 (26/5), or in an emergency, dial 999.”