Alan, re BAC, I recall that we have disagreed about this point before.
Although the source document is headed BAC, it describes a wide ranging work packages shared between Government - DTI, MOD PE, and industry. The breakdown of cost was split between the Ministry, BAC, and HSA.
HSA specific responsibilities concerned marketing, modelling, noise, future projects, simulation, flight test, and ENF acoustics (shrouded propeller, ducted fan?), but there was integrated exchange of ideas amongst all parties.
Within the projects it is possible to identify the separation between those which contributed to Airbus A300 and the 146, although at that time there appears significant military influence with a larger aircraft and STOL.
My first association with this programme was with RAE - terminal area studies, ATC, noise, steep approach, and ground and airborne equipment (significant avionics content). Also, the advanced flight deck, physically at Weybridge but operationally managed by Hatfield with RAE oversight.
The extract was published in the Woodford Design department internal magazine ‘Team 146’; date wise after the demise of Hatfield.