I suppose it was but I didn't expect my battery to die after such a short time.
My previous car, I could have had the radio on for hours and it wouldn't have gone flat.
Anyway I managed to get a jump start from a kind person parked alongside me.
Moral of the story
A. Keep a set of jump leads in the car in winter time.
B. If your battery dies and you phone the breakdown company, don't admit to having the radio on!