Peter Ustinov in Tibet/Nepal

My google fu has run out of gas.
I distinctly remember a documentary style travelogue in which Peter travels through Tibet/Nepal. The scene I am trying to find is one where the whole crew is sick with altitude sickness and flu and they encounter a female native on horseback who laughs and rides away.
I am certain I have seen this but can find zero web reference, so…
A little hep?
Thanks

There is a Michael Palin travelogue documentary, Himalaya, where he and the crew suffer altitude sickness.

And there’s Ewan McGregor and Charley Boorman’s Long Way Round where they encounter a native guy on horseback in Mongolia who laughs and rides away.

Thanks, it was the Palin one, now seeking brain mechanic to see how I could have slipped mental gears so badly. Thanks