Here is an extraordinary piece of film. It is a live outside broadcast of a British army simulation of an attack on a train in Britain. It went out at prime time on a BBC programme called Saturday Night Out.
And it happened in 1956.
I have tried to find out whether the British government and army were planning for an attack by Cold War Soviet sleeper cells, or the IRA. Or whether they were training to do sabotage themselves. But no one seems to know.
The commentary is wonderful - especially at the end. And Saturday Night Out had a great catch phrase
SATURDAY NIGHT OUT
AS THEY HAPPEN
WHEN THEY HAPPEN
AND WHERE THEY HAPPEN