[4] In 1816 George's son John Thomas Brooks (1794–1858) was given Flitwick Manor on his marriage to Mary Hatfield.

The grounds were praised by the landscape architect John Claudius Loudon in the 1820s and 1830s, especially the arboretum, planted in a "natural arrangement".

[5] John Thomas Brooks wrote several diaries which give a picture of life at Flitwick Manor.

The most important event in these diaries seems to be the death of his only daughter, Mary Ann Brooks (1822–1848), who died aged 26, in 1848.

Major John Hatfield Brooks was educated in Rugby, Warwickshire and later became an officer in the 1st Bengal Light Cavalry.

When John died in 1907, his eldest daughter Catherine Mary Frances Brooks (1853–1934) inherited the house.

After being advertised for sale, Flitwick Manor was bought by Anthony Gilkison, a film director, who lived there until the early 1970s, when it was purchased by The Saxby Family.

[10] In 2009, the main park including the arboretum and two adjoining fields to the south of the property were acquired by Flitwick Town Council to preserve it for the community.

[12][13][14][15][16] The manor was featured in the episode "The Jim Twins/Flitwick Ghost" of the television series Strange but True?

[19] Historic England dates the 20th century work to 1936 and ascribes it to Sir Albert Richardson.

[21] The pleasure gardens surrounding the house were laid out by George and John Thomas Brooks in the late 18th and early 19th centuries.