April fool's day. BBC recalls a hoax of the fifties when Panorama presented a documentary in high seriousness purporting to show Swiss workers harvesting spaghetti from trees. Up to Kilburn in lovely twentyish shirt-sleeve weather. Wine, chocolate, bananas, cherry tomatoes. Hyde Park in the afternoon is bursting with life - budding trees, small children with scooters, dogs enjoying their freedom, elderly people with newspapers, cyclists, mothers and au pairs pushing prams, young lovers. We estimate that about 10% of the people who pass us are speaking English - a very multi-ethnic lot.