Procol Harum received a paragraph in the Outside World section of issue one of The Prisoner: The Official Fact File partworks from Deagostini publishers, currently available in the UK. [For US readers, a partworks is a limited-run magazine. They tend to be on such topics as knitting and gardening, but recently we've seen Morse and Thunderbirds partworks]
Here is the lead-in and the Procol nod:
"Record companies had been quick to exploit this new trend ['...the youth movement...Bright young things danced barefoot on the grass...'] and Scott McKenzie's San Francisco (Be Sure To Wear Some Flowers In Your Hair) and Let's Go To San Francisco by the Flowerpot Men, were lightweight worldwide hits. The more credible anthem for the long hot Summer of Love was Procul [sic] Harum's A Whiter Shade of Pale – a haunting tale of angst that spent five weeks at number one and featured a swirling doomy theme, heavily borrowed from Bach."
This section is, alas, not illustrated with a shot of Procol, but rather with flower-children running in a circle. One person, wearing paisley shirt and shades, looks like Richard Branson. But he probably isn't.
A Whiter Shade of Pale