About 25 or more years ago I saw a British thriller. Set in about 1880 in England. Wealthy family. Large home. There are 2 brothers A and B and a mother. A is gay. B sleeps with A's wife. A poisons B. Mother knows that A is gay. Dr. treating B is fired. I believe there is a toy store they own. Toys are used to kill. A is poisoned in his club in the end'
Mother admonishes A when she sees him walking across their laws in female garb. The druggist who sels A poison notices his shoes
I am sorry if this sounds confusing
I am sorry to bother you and thank you in advance
John
glasfitz

It's The Blackheath Poisonings.