On 04 Aug 1936 John Charles William Fitzroy 9th Duke Grafton (age 22) was killed racing his Bugatti at the Limerick Grand Prix. His first cousin once removed Charles Alfred Euston Fitzroy 10th Duke Grafton (age 44) succeeded 10th Duke Grafton, 10th Earl Euston, 10th Viscount Ipswich, 10th Baron Sudbury.

Earl Arlington, Viscount Thetford, Baron Arlington of Arlington in Middlesex and Baron Arlington of Arlington in Middlesex abeyant between his sisters Margaret Jane Fitzroy (age 20) and Mary Rose Fitzroy (age 17).