Conversation so far:
What is significant in Jeremy Brett's private life?
On 24 May 1958 Jeremy Brett married the actress Anna Massey.
Did Jeremy Brett and Anna Massey have children?
Jeremy Brett and Anna Massey's son, David Huggins, born in 1959, is a British cartoonist, illustrator and novelist.
What health issues did Jeremy Brett have?
In the latter part of 1986, Jeremy Brett exhibited wild mood swings that alarmed his family and friends, who persuaded him to seek diagnosis and treatment for bipolar disorder.

Question: When was he diagnosed?
Self-contained rewrite: When was Jeremy Brett diagnosed with bipolar disorder?