Every now and then in that era, and the years leading up to it, there'd be the weird oddity creep in: Van Der Valk theme and Stranger on the Shore are two that come to mind. There were quite a few by Russ Conway - Sidesaddle was his big one, wasn't it? - and others...

When it was charting in August 1965, according to a quick Google, we also saw What's New Pussycat (Tom Jones), Everyone's Gone To The Moon (Jonathan King), Zorba's Dance (Marcello Minerbi) and something called Darlin' Jill (Hugo Montenegro Orchestra) so maybe it wasn't quite such a novelty?

--
Hamish