Psychedelic Plaid Cymru

Looks like Plaid Cymru were attempting to win over the psychedelic vote with this lysergically toned election poster from back in the day. Judging by the caricatures of Harold Wilson and Ted Heath in the top right-hand corner I'm guessing it must have been printed in either 1970 or 1974. Today's political imagery (from all the main parties) tends to be drearily corporate so it's interesting to view an example of an unconventionally designed election poster. Wonder if the acid demographic turned out and voted Plaid that year? I’m indebted to Huw Jones for sending me the pristine scan.