Driftless
Donor
I don’t think omitting the Beln
I’m not sure on the Beaufort. When you look at the RAF Specdicarions, https://en.m.wikipedia.org/wiki/List_of_Air_Ministry_specifications#1930–1939 the Beaufort’s is before the Blenheim. However, Wikipedia does say the Beaufort was designed after the Blenheim. Presumably if there’s no Blenheim, Bristol would have still made something for the Beaufort.
When you look at the list of RAF Specifications, you see many aircraft that can replace the Blenheim.
As I understand it, the Beaufort and Beaufighter used several jigs and tools created for the Blenheim, particularly for the wings, tail, and engine mounts and cowlings. If the 142 is stillborn, then the Beaufort and ensuing Beaufighters probably are clean-sheet designs.