UK New Entry 1971 (136) Mary Hopkin - Let My Name Be Sorrow
ESC 1970 07 - United Kingdom - Mary Hopkin - Knock, Knock, Who's There?
UK New Entry 1970 (60) Mary Hopkin - Knock, Knock Who's There?
1970 UK: Mary Hopkin - Knock Knock Who's There (2nd place at Eurovision Song Contest in Amsterdam)
UK New Entry 1970 (197) Mary Hopkin - Think About Your Children
Mary Hopkin ~ Knock Knock Who's There 1970
Eurovision 1971 - United Kingdom
UK New Entry 1970 (20) Mary Hopkin - Temma Harbour
Mary Hopkin - 'Knock Knock Who's There' - Mono to Stereo Conversion
Top Ten UK Eurovision Song Contest Entries: #9 'Knock Knock Who's There' (Mary Hopkin)
Eurovision 1970 Ireland - Dana - All kinds of everything (Winner)
Clodagh Rodgers - Jack In The Box Live Eurovision 1971 United Kingdom
1970 Mary Hopkin - Knock, Knock Who's There?
Those Were The Days - show trailer
ESC 1971 09 - United Kingdom - Clodagh Rodgers - Jack In The Box
Mary Hopkin - Knock, Knock Who's There
UK New Entry 1971 (145) Daniel Boone - Daddy Don't You Walk So Fast
Eurovision 1976 - United Kingdom
UK New Entry 1971 (138) The Tams - Hey Girl Don't Bother Me
Mary Hopkin - Knock Knock Who's There (Stereo Mix)