As to the US not offering the Nordern to the RAF it was
just as much a factor that the RAF did not consider that
tachometric bombsights such as the Norden, and British
ABS Mk 2 were suitable for night bombing from medium
altitudes. As a result the main BS used bu bomber command
would be the Blackett (MK XIV) which was simpler
and did not require as long a run up as the Norden

Keith

Uh, the Brits DID use the SABS Mk.IIA from 1943 for precision bombing
(in clear weather, of course)!

Rob