Conversation so far:
what were james may's toy stories?
James May's Toy Stories is a 6-part TV series showing favourite toys of the past era and whether they can be applied in the modern-day.
what were some of these toys featured on James May's Toy Stories?
The toys featured on James May's Toy Stories were Airfix, Plasticine, Meccano, Scalextric, Lego and Hornby.

Question: what was his greatest accomplishment?
Self-contained rewrite: what was James May's greatest accomplishment on Toy Stories?