First recorded by Tom Courtenay (1963).
Hit version by Herman’s Hermits (US #1/SWE #4 1965).
From the wiki: “‘Mrs. Brown’ was originally sung by actor Sir Tom Courtenay in The Lads, a British TV play of 1963 and released that year as a single by Decca Records.
“Herman’s Hermits recorded the song as an afterthought in two takes, never dreaming it would be a single let alone hit #1 in the US. According to Peter Noone, the song was well-known to British bands; it would often be performed at birthday parties, substituting the name of the girl whose party was being celebrated, i.e., ‘Mrs. Smith’ or ‘Mrs. Jones’ instead of ‘Mrs. Brown’.”
Herman’s Hermits, “Mrs. Brown You’ve Got a Lovely Daughter” (1965):