The talk had several interesting points, but no fundamentally new revelations. Lots of details that were new though.
Most interesting to me was the WG.42 from 1982 which was small, single-engined and intended to be simple to maintain at the front line. The crew sat side-by-side in titanium 'dustbins'. Although different in every way, it reminded me of the Cierva Weir W.9 for some reason.
The Army requirement moved away from small and light to big and 'capable'. This also meant expensive so the WG.44 was put forward with a WG.30 rotor head to save costs. Signatures were lower but not by enough.
Tonal and WG.47 were the answers to ever increasing requirements. The latter had a very complex IR suppression system. The twin tail rotors reduced RCS and also allowed pilots to stop the aircraft rapidly by pulling the nose up to 45 degrees without ballooning or overspeeding the rotors. This was seen as a useful tactic.
The odd 'low glint' canopy (originally on the WG.42) was hated by pilots who tried the mock-up. It was made bigger as a result, but the rear gunner had only limited side vision, although their cockpit was 8 feet wide!
Overall WG.47 seemed a bit problematic. Very heavy, the most drag of any design ever tested by Westland, and with non-retracting gear, no gun and other limitations it seems it was very much a work in progress when it ended.
Comanche seemed better thought through, and the speaker spoke favourably about it compared to WG.47, but it was hugely expensive.
I asked permission to take pictures of some models on display at the end, which the speaker gave. Note the rotors are from a Lynx model, not the all-new 'stealth' blades and faired rotor head of the actual design.