Residents are being warned to be vigilant following a suspected rogue trader incident in South Lynn.
Police say a man went to a property in Wisbech Road at around 2pm yesterday afternoon and offered to carry out some gardening work for £40.
Although the resident agreed to have the work done, the man is said to have demanded £240, six times more than agreed, after it was completed. He left after the resident paid.
Officers believe two other men were seen in the area in a van at the time.
Anyone with information about the incident is asked to contact police on the non-emergency 101 number.