This is a song written and recorded by Barry Gray (probably in his German bunker studio in Guernsey, where I come from) and featured in a episode of Thunderbirds called The Cham Cham. It is set in the exclusive ski resort of Paradise Peaks where the resident band is the Cass Carnaby Five. And there is something fishy going on that is related to the tune. It’s on the radio all the time, the Thunderbirds cast really dig it, and it certainly is a nice melody, even when sung in a sort of Marlene Dietrich style by Lady Penelope. In reality this was Sylvia Anderson, the series’ co-creator with husband Gerry. What a great way to make a living.