Correct, the BBC has a long tradition of presenting a fake documentary clip on April Fool's day. Not sure if it was the first one, but you can find a very old BBC April 1st clip on the "traditional yearly harvesting of spaghetti", where you see villagers pick fresh and ripe spaghetti from the spaghetti trees, carefully laying them in the baskets they carry...

Not sure if this is the best clip:

https://www.youtube.com/watch?v=tVo_wkxH9dU

And context:

"At the time (1957) spaghetti was relatively little-known in the UK, so that many Britons were unaware that spaghetti is made from wheat flour and water; a number of viewers afterwards contacted the BBC for advice on growing their own spaghetti trees."

> so that many Britons were unaware that spaghetti is made from wheat flour and water

I doubt many Britons know that now to be fair. I could easily imagine this jape catching people out today.

Really? I suspect many people wouldn't know the exact ingredients or manufacturing process, but I think almost everyone knows that it doesn't grow on trees!