Harrier 2+
I think you're referring to the 2+, which has not only a cut-down F-16 radar, but strengthened rear fuselage, upward firing chaff / flares etc.
Once saw one fitted with 6 x AMRAAM on decoy launching rails, though not so sure about bring-back.
Would have been a sensible buy, even in small numbers, to go alongide the GR7 / 9 on the present & future carriers, as it's mainly compatible.
Not that I could imagine the Dave ever becoming delayed, or the UK inconveniently having a foe in the meantime.