BBC Radio was once the entertainment of choice for the British public back-in-the-day. As it is today, long before the Tweenies and In the Night Garden, part of the BBC's output was directed at the nation's children in an hour long programme entitled, creatively, "Children's Hour". Bishop & Stonier produced nursery ware to tap into the affection for the programme and these pieces are now very collectible for Bisto and nursery ware fans. I have not found any other factories making baby plates which commemorate this radio programme so perhaps Bisto were specially commissioned by the BBC to produce the range? Who knows.