Aviate.
To second XH175's TANS, the aircraft is fitted with a Decca 72 doppler radar Ground Speed & Drift Meter (the instrument with the two coloured fault indicators next to the ADI). The large orange square is a Weather Radar Indicator - looks a lot like an old Bendix. TANS was a peculiarly Navy unit although the only one I ever installed was on an RAE 1-11 - which is borne out by the "NAVY" call sign on the NAV's desk. My guess would be either Sea King or possibly a Tracker (probably 70's vintage - don't think TANS was available until then).