I just received from Amazon, a versatile charger with 6 interchangeable plugs to replace what powers my John Lewis clock radio . Thought the little jack plug had failed , turned out to be the 6V power socket in the radio :C Took it to bits ...nightmare to replace the plug .
I was unsure as to whether the device , called a charger, was OK for continuous use powering a radio .
Just to add that although out of guarantee , John Lewis offered to pay half of the cost of the charger as they don't do a replacement .