In 1871 they are in Cardiff St. Mary, listed as "Buston" (RG10/5363, folio 118 page 36)
Address 46 George Street
Richard Calcut, 44, mariner, b. Somersetshire
Ann, wife, 42, b. Pill
Fanny M, dau, 10, b. Clifton
Alfred Buston, lodger, 23, b. Portishead,
Emily, wife, 25, b. Pill
Celia M, dau, 4, b. Cardiff
Emily, dau, 3, b. Cardiff.
In 1881 they are indexed as "Burstan", and the children are Emily A, Lilla, Maggie and Alfred.
Also in Cardiff in 1881: Ann Calcut, 47, b. Bristol, and granddaughter Emily, 16.
She is probably the Emily A. Burford d. 1922 in Cardiff aged 77