Ted Willis (1914-1992) was a British playwright, novelist and screenwriter who was also politically active in support of the Labour Party. He was listed in the Guinness Book of Records as the world’s most prolific writer for television, and also wrote 34 stage plays and 39 feature films.
Remember reading this years ago and I believe it was serialised in possibly the Mail or Express as there were TV adverts featuring the train scene. Read it again and not a great story with a poor ending. I can see certain members of the British public salivating at it until near the end though.
Fairly dreadful novel about a right-wing unit put together to clamp down by all means necessary on behaviour that Daily Mail readers found upsetting at the time. Note that this was written around about the time of large-scale strikes in the UK, and that Margaret Thatcher became Prime Minister just a couple of years after publication.