The RAF Ensign is flying above a Grantham café to mark the 75th anniversary of the Battle of Britain.
As a former member of the RAF for 22 years, Ged McKnight flies the flag every year on the anniversary of the Second World War battle.
He said he felt it was more important to follow the tradition this year as, today, the country marks the 75th anniversary of the fight between German Luftwaffe and the RAF.
The flag went up yesterday (Monday) and passers-by will be able to see it all week. However, concerned that the flag might be pulled down, Ged will take it down each night as he locks up.
He said: “I put up the flag because I wanted to show that somebody cares.
“I’m ex-Air Force, I did 22 years. There’s a lot of ex-RAF in the area and this flag is something that will hopefully make them feel good.”