"Our technical experts advise us that once the power back-up is disconnected from the mains there is a low risk of overheating or fire. Therefore, we urge customers to disconnect the power back-up immediately and reconnect their wireless landline connection box to the power socket."
Spark will be contacting individual customers soon to advise them on the next steps, including offering them an alternative means of communication should this be required in the event of a power outage.
Customers can either bring the power back-up to their nearest Spark store or contact Spark directly on 0800 159 159 to arrange for collection. In the meantime, customers should store the device in a cool, dry, ventilated place like on a table or garage floor, away from direct sunlight or water.