The theft happened at Harrison's Garage on Upgang Lane at 3pm on February 7.
Police are asking anyone who recognises the man or has information about the theft to call them on 101, select option 2 and ask for PC Marie Williams.
You can also email [email protected], quoting reference number 12210054906.
Information can also be passed on anonymously via Crimestoppers on 0800 555111.
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