In the mid 90s I watched an educational documentary narrated by a very young Chris Evans for biology class. It had been taped off the telly from channel 4 or bbc 2.

Anyhow in one scene there is a beach shot and this incredibly hot young woman in a bikini who takes over the narration. That woman was Carol Vorderman. 

Tried to look it up online but I can't find it anywhere. Anyone?