The thieves broke through a metal wall to get access to the garden centre and so did not set off the alarm.
GCS (GB) Managing Director Jeremy Davies said: "Due to their huge consumer popularity, premium brand candles remain a targeted product category for both petty thieves and professional criminals alike. It is therefore important for business owners to add security to their weekly agenda. Retailers can find guidance and support how to prevent burglary and customer theft at www.gcsgb.com or call GCS on 01892 300878."Anyone with information relating to the incident, or who is offered any discounted Yankee candles, is asked to call Gwent Police on 101 quoting log number 120 31/3/15.
Meanwhile, on 7 April, a conman who pretended to work for Dobbies Garden Centre in Southport followed an 87-year-old woman home and demanded cash.
The pensioner was followed home and then approached as she parked her car. The man told her he was the shop manager, and that she owed £200.
The pensioner called out to a neighbour and he drove off.