Mary Millington’s True Blue Confessions (1980)

One IMDb review:

The life and early death of Mary Millington remains one of the saddest episodes of British cinema history. A woman whose sexual honesty and openness was abused by business men who viewed her as little more than a cash cow.

This “tribute” has to be watched with open mouth as producer Sullivan uses it to make a quick killing and preach his own self-serving propaganda over someone else’s grave. Sex, death and politics don’t really go side-by-side. We even have Marie Harper pretending to be Millington in her coffin!

So basically it’s Mary Millington’s Game of Death.