A Burgh le Marsh man aged in his 90s has been cheated out of cash on the doorstep - during a police-backed campaign against rogue traders.
The pensioner was visited at his home in Storeys Lane home by two young men who told him that his car port roof was damaged and needed repairing.
They were given cash for materials and labour but, rather than carrying out proper work, they simply laid some plastic corrugated roofing on the top of the car port.
This sheeting already belonged to the victim and the offenders took it from his garage.
Police are asking residents to look out for their elderly neighbours in the fight against doorstep crime.
The offence happened during last week's Operation Rogue Trader week.
PC Dave Dixon, from Skegness Police Station, said: "It is a sad irony that this offence took place during a week where police and Trading Standards were raising awareness of doorstep crime.
"Although there is excellent advice and guidance available on how to protect yourself from rogue traders, it is worth remembering that the more elderly and vulnerable members of our communities find it hardest dealing with callers at the door and they are at the greatest risk.
"I would ask everyone to look out for their elderly neighbours and be vigilant to any suspicious activity going on at their address.
"Always report concerns to police as quickly as possible on 101."