That scene where the family eats potatoes after the explosion? Filmed in a real potato field outside Wrotham, Kent. The farmer was paid a fortune. He also had to let them plow his field into a mess for the explosion.
The kids playing Jemima and Jeremy were told to really eat cold potatoes. They hated it. The director made them do it seven times. That’s why they look so miserable. It’s not acting. It’s potato trauma.
The field today is still a farm. No explosions. No singing potatoes. Just cabbages and the occasional cow. But if you squint, you can hear the “Toot Sweets” song. I promise.