The birth of the prospective bride, Emma Alexandra WEBB, was registered in Oxford in Q1 1993 (mother's maiden name Haselden). Her parents, Michael Charles WEBB (born 6 VII 1952) and his former wife, née Bridget HASELDEN (born 1961), were married in 1985. Her father is the third and youngest son of William WEBB (30 XI 1911 - 1991) and his wife (married 1948, as her second husband), Kathleen Matilda SPENCER-NAIRN, MBE (12 VII 1913 - 23 IX 2003), the eldest daughter of Maj Sir Robert SPENCER-NAIRN, 1st Bt (11 VII 1880 - 20 X 1960).
Miss Webb's mother is the daughter of the Rev Eugene John Charles HASELDEN (1917 - 7 VI 1999) and his wife (married 1959), Christine Nancy GRAZEBROOK (1925 - 25 VIII 2004), who was herself the elder daughter of Christopher John GRAZEBROOK (18 VI 1898 - 25 V 1988), of that landed gentry (LG) family, and his wife (married 1924), Nancy Kate Neild COLLIS (19 VI 1902 - 15 VI 1971).
Richard's posting about the engagement of Miss Webb's sister in 2022 is at
https://groups.google.com/g/peerage-news/c/uU7A7lGlFfA/m/vyjiqJCkAQAJ. Her stepfather, Christopher John ROUPELL (born 23 IX 1957), is a member of that family, formerly of Charlton, which, per Burke's Family Index, last appeared in Burke's LG in the 1952 edition.