http://youtu.be/koJxSCSGDkA
24 June 1973 Hits a Go Go, Seeheim Germany
durch die Sendung führt Eddy Becker Mott The Hoople - Drivin‘ Sister Kaminski & Gottemeier - Hauptsache daß man von Gestern ist Wind - Josephine Lynsey De Paul - Sleeping Blue Nights Greater Union - Heaven Help Greater Union - Jimmy Webb Medley Deke Leonard - Diamond Road Wind - The Princess And The Minstrel Amiel Cartwright - Pretty Baby Mott the Hoople – Honaloochie Boogie Lynsey De Paul - All Night Wolfe Tones - The Black Ribbon Band
So it appears Deke Leonard was filming the same show, doing his first solo single, which explains how he came to be there. Deke was a friend of Overend Watts.
Notice Lynsey DePaul was also there - according to Campbell Devine's book this is the event where the name Ariel Bender was coined.
In Deke's latest book "Maximum Darkness" he writes:
"I did the show (it was only miming to ‘Diamond Road’, my latest single, but it was three minutes of exposure on Teutonic TV). Mott The Hoople, old friends, were on just after me and I, coming off, passed them, going on. Ian Hunter grabbed me and dragged me onstage with them, where I mimed to their latest hit, ‘All The Way To Memphis’, sharing a mike with Ian. That was a nice gesture, don’t you think? Of course, it screwed up all the camera angles, rehearsed the previous day, and induced a collective nervous breakdown among the studio technicians. But great art requires great sacrifices, especially by somebody else."
Deke actually shares the mic with Overend; the performance appears to be a tape over live vocals.