_. The engagement was announced 20 September, 2018, between Thomas G.A. Sinclair, eldest son of Mr Alan Gordon William Sinclair (born 1956), of Adstock, Buckinghamshire, and Mrs Sinclair, and Sophie Louise Twiston-Davies (born 1990) scion of that landed family, & descended from the Archdale Bts, eldest daughter of Audley William Twiston-Davies (b 13 Nov, 1950), of Kilpeck, co Hereford, by his wife the former Hon Caroline Mary Elaine Harbord-Hamond (b 15 Dec, 1960), scion of the Barons Suffield (Baron, GB, cr 1786), dau of the 11th Baron Suffield, MC.
Thomas Sinclair's paternal grandmother is Lady Bridget Sinclair (nee Fortescue), scion of the Earls Fortescue,
Sophie Twiston-Davies's mother was a childhood friend of Diana, Princess of Wales. Her elder sister Antonia was one of Diana's godchildren.