The Case Of The Careless Suffragette is a Sherlock Holmes television movie from 1955.
It stars Ronald Howard as Holmes, H. Marion Crawford as Dr. Watson and Archie Duncan as Inspector Lestrade.
The Suffragettes have an enemy to the cause in Parliament, Mr. Pimpleton MP.
Miss Meredith gets two bombs made, so they can blow up the lions at Trafalgar in protest.
Mr. Pimpleton is killed when one is placed inside a croquet ball.
The killer is Agatha, also a suffragette, but with the motive of being next in line as Pimpleton’s heir.
Movie pages here.