Auxiliaries outside the hotel after the attack (the window pictured is the lower right window in the contemporary photo below).
Given that this photo was taken on 11 April 1921, and that most of the recruits to Q Coy only joined ADRIC on 2 April, one can see that some had not yet received their ADRIC uniform
The cadet in dark uniform, leading with his elbow on the wall, right of the centre, is Section Leader of F Company John Charles Reynolds
The cadet in the front with a light RAF uniform is HWW Hatch