This means bringing the POD forward from 1936 to 1924, but...If we can wean Vickers off geodesic construction then they can build something that will then give them factories and a workforce that can build Lancasters later on.
What if Vickers got the contract to build the Rohrbach Ro VI instead of Beardmore, which built it as the Inflexible? Preferably a 4-engine version instead of the trimotor of OTL so it would not be as underpowered. Then Vickers incorporates the lessons learned into the prototypes built to B.19/27 and C.16/28, which in turn result in stressed-skin monoplanes being built instead of the OTL Vildbeest, Wellesley, Wellington and their successors.
Would it also have helped Supermarine learn how to mass produce the Spitfire if it had got the contract to build the Rohrbach Ro IV flying boat, which IOTL was built by Beardmore as the Inverness?