It is quite a good film, in two parts for television, but it is relatively conventional with less of Ken's unique vision and imagery, and not as good as his other Lawrence films.
The book had an interesting history, and Penguin who bravely published it were taken to court for obscenity, but eventually Penguin won and the book was freely available, and opened up British publishing.
DH Lawrence actually wrote three versions of the story, The First Lady Chatterley, John Thomas and Lady Jane and Lady Chatterley's Lover, the last being the definitive version. I have read that Ken included material from all three versions, but I have only read Lady Chatterley's Lover (and a long time ago) so I can't say what. Maybe a good excuse to read more of Lawrence.
Ken of course also did Lawrence's Women in Love and The Rainbow, and St Mawr was abandoned project.
Iain