He was responsible for various renovations to the castle, including the construction of the State Dining Room and the private apartments.

His early dalliances with the Neo-Gothic style even caught the attention of the infamous Horace Walpole, who referred to him once as "little Brooke".

Lancelot "Capability" Brown was hired by the Earl to redesign the gardens and grounds surrounding the castle.

[3] Francis was a significant patron of artists, his account ledgers at Hoare's bank include references to artists such as Joshua Reynolds, Thomas Gainsborough, Allan Ramsay, Angelica Kauffmann, Thomas Patch and George Stubbs.

His son George Greville, 2nd Earl of Warwick further improved the castle and bought many of its present furnishings.