if you enjoyed the book this film is loosely based on, then you are likely not to enjoy this film that much. There is nothing wrong with any of the actors, in fact the children pull quite a performance. But the changes to the original story leave too many unknowns, and completely change the tone of the story. The later adaptation was more convincing.
This is quite an oddity, worth watching for curiosity value. Looks dated even for 1963 - but very ethnically diverse for then, via the unexplained conceit that somehow the children of foreign embassy staff in London are these 'special children'. Why? We are not told.
But it shows how non-ethnically diverse London was back then. Often films of 1960s and 50s, such as THE INNE OF THE SIXTH HAPPINESS had to use embassy children as actors - Chinese in that case.
It's very much a B-movie, with a Welsh character defending children against heartless authorities. So there is the plot.
Watch Village of the Damned - a real classic - based on The Midwich Cuckoos and avoid the awful woke pc Sky Tv series made recently. Watch this as an extra.
3 stars. Just.