There are no different Army ranks: just alternative titles for the same ranks. AS1(T) and Chf Tech are separate ranks, not just alternative titles for ranks already listed.
Glad there’s a new one with a more modern and cleaned up look to it. The one you used to get (with the cartoons) wasn’t always a great one to use. And adding Civil Service should be helpful though maybe not in a cadet setting.
Pretty much the case that if they’re infantry they’re a Colour Sergeant - because these were the people responsible for the unit’s colour (standard) during war.
Almost everyone else is Staff Sergeant, with some exceptions (Household Cav are weird with their Staff Corporals).