The incident happened at around 7pm on Tuesday, June 21, when a man entered the Nisa store in High Street and stole the tin from the counter. He then fled the scene in a blue car.
The man is described as white, approximately 40-years-old and wearing a blue and white striped hooded top. The driver of the car is described as a white man wearing a red football shirt.
PC Hayley Carroll, investigating, said: “Stealing funds raised for a charity is despicable and we will not tolerate these types of offences.”
Officers are investigating to see if the incident is linked to a robbery which took place outside Aldi on the same evening.
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Anyone with information is asked to contact PC Carroll on 101 quoting reference number JD/24847/2016. You can also call Crimestoppers on 0800 555 111.