The Gaunt Bham mark does not match the years of use.
Hymers Cadet Corps was affiliated to the East Yorkshire cap in 1902 and wore the slouch hat. The photo has a EY VB poster in the background. The website describes it as 1920's but I think this is an error as it is likely to be 1905-10 judging by the VB poster , slouch hats etc. The school magazine records that the Cadets were issued brass OTC 'shoulder-plates' in late 1908 where as the VB style of cloth shoulder patches can be seen in the photo.
At some point they used the rose without the scroll as an OTC as shown from this 1925 summer camp.
At some point after 1938 (I assume in WW2) they returned to the East Yorkshires cap badges. The Hymers College CCF forsook their brass East Yorskshire caps in 1969 for the a/a Yorkshire Brigade cap badge. The CCF was closed in 1977 when the last CO retired.
It was re-raised in 1992 as an ACF.
The screenshorts are from larger photos:
http://hymerscollege.daisy.websds.ne...ta_photographs