In the UK, a yellowfaced bird was first produced in 1934-1935 by E H Stevenson of Cambridge - a yellowfaced Cobalt cock, and Mrs G Lait of Grimsby and J Long of Gorleston-on-Sea both bred them in 1935 [REF].
By 1937 several breeders in the UK had yellowfaced birds, and Stevenson and Tucker exhibited one at the Crystal Palace in that year [REF].