I think the Tornado AR5 had two supplies from the respirator, the main oxygen pipe (whistling handbag) and the smaller diameter one for demisting the visor/in aircraft use(?). If I recall we used the non NBC ones daily and the NBC ones were for taceval fun only. The spare Lemo leads for Mk4 helmets remained silver into the 2000s, although all night capable leads were black from the early 90s. The red ‘connection dot’ on the male/female ends were over painted white tintalite ink to make them easier to see at night, although bent pins were quite easy to fix once you developed the knack (quite often on Tornado, never needed to fix one on Harrier)..