Ollie and Fred's Five O'Clock Club  
ITV
Puppets

On the Farm
BBC
08 July 1970 -

On Your Marks
1998

Once Upon a Hamster
ITV
1972 -

Orlando
ITV
1965

Orm and Cheep
ITV
1983 - 1985
Puppets

Oscar the Rabbit
ITV
1970s

Out of This World
ITV
April 1990 - April 1992
Comedy

Outdoors, The
1950s

Over the Moon
BBC
04 October 1978 -
Animation

Ox Tales
ITV
1987 - 1988
Animation