Trust video editors to wreck it. Killjoys.
The beginning sequence is a misty romantic sequence of a sewing room table - threads, little tins of pins, scissors, material, cutting shears, sewing machine in background, all very old fashioned and ethereal - and then a close up of a needlewoman's hands as she embroiders a few stitches of a shoulder badge for a ceremonial military uniform, and finally another close up of the badge as it is stitched to the jacket. The badge bears the title of the film.
What is the title on the version you have seen? Obviously the title here was for home consumption only.
Joe, the "little black car" you refer to is a London Hackney cab. They have acres of room inside. There is no footage on the version we have of children in a bus. We see children on a guided tour of the Palace sneaking to the window when they see the cab arriving in the courtyard.
This all just goes to show that there are fifteen versions of everything. Perhaps I should do an alternative version of this post in half an hour's time.
I don't whether to feel sorry you missed out on a truly wonderful original bit of video, or to feel special that the treat was just for us.