Here is my attempt.
Back row: Dave Horn (trainer), George Graham (coach), ???, ????, David Fry, Paul Barron, Terry Boyle, Ernie Walley (coach) and Allan Harris (coach)
Middle row: Terry Venables, Mike Flanagan, Paul Hinshelwood, Billy Gilbert, Terry Fenwick and Frank Lord (coach)
Front row: Steve Leahy, Tony Sealy, Jim Cannon, Vince Hilaire Clive Allen and Gerry Francis
Am I right about second left in the back row being George Graham? And I'm not sure about 2nd right and far right in that row being Walley and Harris. Charlie Simpson the physio is usually in these photos.
Several players are defintiely missing: Peter Nicholas, Jerry Murphy and, I think Ian Walsh too. Although Walsh may be to the left and in front of of David Fry. As for the other unidentified player is in that row - maybe Steve Brennan?