Top of the Pops often resembled a children’s party in the early Seventies. Especially when Wizzard were in the studio.

There were plenty of eccentric characters in Glam but none more eccentric than Roy Wood. He was also undoubtedly the hairiest. And the most musically talented, with an ability to play almost any instrument and an uncanny ability to imitate Phil Spector’s Wall of Sound.

Here he is with rainbow-coloured streaks in his gigantic thatch of hair, runic symbols painted all over his face, wearing a wizardy cape, with the rest of Wizzard dressed up as gorillas, roller-skating angels, Teddy Boys and a gaggle of girls – credited on the label as The Suedettes – doing a hilarious teapot dance.

The band are so obviously miming that no one has even bothered to plug a lead into their instrument and the sax player doesn’t even put the instrument to his lips when his solo arrives. Wood, meanwhile, uses his French horn as a stage prop but clearly can’t be bothered to play the thing.

If anyone is thinking it sounds strangely familiar but they can’t quite place why, they might like to know that ABBA would later acknowledge its influence on Waterloo, the song that won Eurovision a year later and launched their career.