Conversation so far:
What did Benjamin Henry Latrobe do in england?
Latrobe returned to England in 1784, and was apprenticed to John Smeaton, an engineer known for designing Eddystone Lighthouse.
What is going on in life?
Then in 1787 or 1788, he worked in the office of neoclassical architect Samuel Pepys Cockerell for a brief time.
What did he try next?
In 1790, Latrobe was appointed Surveyor of the Public Offices in London, and established his own private practice in 1791.
What did they try next?
Latrobe was commissioned in 1792 to design Hammerwood Park, near East Grinstead in Sussex, his first independent work.
Waht did they want to change?
Latrobe was involved in construction of the Basingstoke Canal in Surrey, together with engineers John Smeaton and William Jessop.

Question: What did they want to try next?
Self-contained rewrite: What did Benjamin Henry Latrobe want to try after the construction of the Basingstroke Canal