Conversation so far:
How was Georgette Heyer's marriage life?
Two months after her father's death, on 18 August, Heyer and Rougier married in a simple ceremony.
Did they have a happy marriage?
She insisted they return to England before starting a family.
What happened during their marriage?
In October 1925 Rougier was sent to work in the Caucasus Mountains, partly because he had learned Russian as a child.
Heyer remained at home.
What led to her wanting to return to England?
In 1928, Heyer followed her husband to Macedonia, where she almost died.
What led to her almost dying?
a dentist improperly administered an anaesthetic.
Did she get treated for it?
CANNOTANSWER.
Did she stay in the hospital?
She insisted they return to England before starting a family.
Are there any other important aspects?
The following year Rougier left his job, making Heyer the primary breadwinner.
After a failed experiment running a gas, coke, and lighting company.

Question: What happened after the failed experiement?
Self-contained rewrite: What happened after Georgette Heyer's failed experiment running companies?