Drum Major is Dave Masheder (Clive 1970),
and to his left (behind) is Steve Woolgar (Clive 1971).

Trumpet players - Steve Le Feuvre (Clive 1975) is the first trumpet player on band's left file (right of picture). Will Coleman (Clive 1975), with glasses, can be seen in the same rank (line) to Steve's right, and Ed Coleman (Clive 1971) is in the same rank on the right file of the band (to the left of the picture).

Can anyone help to name some others?