Conversation so far:
What is top gear?
Top Gear is a show that started in April 1977, as a half hour motoring programme on the BBC in the United Kingdom.
Who did James May present Top Gear with?
James May presented with Jeremy Clarkson.
How long was James May on the show Top Gear?
James May was on the show for 13 years.

Question: Why did he not continue?
Self-contained rewrite: Why did James May not continue?