There are multiple bands with the name Mandrake:
These are photos from concerts where Mandrake played, so they may be of other bands that played the concert as well.
David Bowie / Michael Chapman / Junior's Eyes / Mighty Baby / Mandrake / Hutch / RAT / Blondell / Chest Fever / Flesh Sep 28, 1969 Hull, England, United Kingdom Uploaded by Zimtrim
Yes / Mandrake / Paddle Steamer Jun 25, 1969 London, England, United Kingdom Uploaded by Zimtrim