Climebear
I note you fail to quote the rest of the regulations on No 14 dress
"0602. Occasions for wear. No 14 Dress is worn by all ranks, when actively employed on flying duties unless otherwise ordered. It is not to be worn routinely in off base areas (See Chap 1, Para 0110 regarding travel to and from work). It is not to be worn in public areas of Officers' or Sergeants' Messes after 1900 hrs daily. When employed on ground administrative duties or when a standard dress is ordered, aircrew personnel
should wear the standard RAF No 2 Dress."