Sorry to interrupt, but Armstrong-Siddeley's reputation for building 2-row engines of 14 cyl.s had a long heritage of poor power, vibration, and a lack of reliability. Every flight of a Mk.I Whitley was considered a crapshoot, and Armstrong-Whitworth's own Ensign airliner was re-engined with single-row Wright Cyclones. Three Tiger-powered Ensigns had been dispatched to Australia. None made it. Their single-row Cheetah was peachy-fine. Perhaps Alvis could have a stab at the Pegasus, but I suspect Nomis doesn't care for them.
The RAF ordered 34 Whitley I's - some of which were retained as test-bed aircraft, followed by 46 of the II's and 80 of the III's with the more powerful Tiger engine - the version with greater production because of war demands was the Whitley IV & V which was powered by the more powerful Merlin engine.
Likewise the Ensign - was plagued by bad luck - the prototype had a dead-stick landing due to the incorrect settings on the fuel cocks. Yes aircraft destined for Australia didn't arrive due to "mechanical problems", otherwise between Heston Aerodrome & Le Bourget in 1939/40 they achieved 100% availability, Wright-Cyclone engines were substituted in order to improve performance - according to wiki.
The Deerhound - their next engine - an ambitious project - three-row - had not surprisingly cooling problems, it this was solved - but in April 1941 the factory was bombed and further work finally terminated in October '41.
So, I don't see Armstrong as being a 'no-go' place to work with, Alvis OTOH would be too busy working on the Pelides!!