He served as Captain of the Honourable Corps of Gentlemen-at-Arms under H. H. Asquith and David Lloyd George between 1911 and 1922.
Colebrooke was the son of Sir Thomas Colebrooke, 4th Baronet, and his wife Elizabeth Margaret Richardson, daughter of J. Richardson.
[1] He served under Sir Henry Campbell-Bannerman and H. H. Asquith as a Lord-in-waiting (government whip in the House of Lords) from 1906[2] to 1911[3] and then under Asquith and later David Lloyd George as Government Chief Whip in the Lords[4] and Captain of the Honourable Corps of Gentlemen-at-Arms from 1911[5] to 1922.
[11] He was admitted to the Royal Victorian Order as a Commander (CVO) in 1906,[12] a Knight Commander (KCVO) in 1922 and a Knight Grand Cross (GCVO) in 1927.
He died in February 1939, aged 77, when the baronetcy and barony became extinct.