. Harriers' integration did not use the full interface and was done fast and dirty
Gaz, for the first 6 months to a year of GR9 it didn't use the full integration as an EPW 2 +, otherwise GR9 wouldnt have had a GPS weapon due to Pw 4 being late with fuze issues. Once it was a PW 4 on the jet and not a 1000 pounder with Pw4 head on it, it was indeed fully integrated onto the jet in all it's modes
I fully agree Harrier could have received clearance for carriage, release and jettison of SS and Brimstone - it's just a question of who was willing to pay for it.
Not could have but would have with brimstone
Cap Eb testing which had begun and was to be integrated included Brimstone and in a mixed configuration too which is still unmatched by any current UK airframe.