The Allisons (Brian Alford and Bernard Day) recorded Are You Sure in 1961and entered the Eurovision Song Contest but only managed 2nd. It didn't matter much as they stormed to the top of the charts with the song. However, they were basically one hit wonders. A pity as I thought they had great harmonies.
(There have been some link problems but clicking the link in the Blog below titled Maria Dallas under the date Wed. 21 January 2009 should take you to all the Folders)