Update 2.15pm: Colin has now been found.
Lincolnshire Police are urgently appealing for help to find a 77-year-old man.
Colin Critoph has been missing from his home in Long Sutton since the early hours of the morning of Monday, September 4.
He is described by police as being in an “extremely fragile mental state” and is also suffering from potentially severe physical ill health.
A police spokesperson said: “We believe that Colin has travelled in his Grey Citroen C5 (registration OV06 BZD) to the Walthamstow area of London and we will be working with the Metropolitan Police to find him as soon as possible.
“If you have seen Colin or his car, please call urgently on 101.
“In an emergency situation please call 999 with incident reference number 15 of today (September 4).”