Okay , so here's one which has been occupying the back of mind for a long time . . .
What if , after their work together on the B-57 , English Electric and Martin keep up their contact ?
While EE make only moderate improvements to the Canberra , before moving on to the Lighning , Martin continue development , via the 'Super Canberra' , Model 316 , and eventually the XB-68 , which is cancelled by the USAF . Now , when the TSR-2 programme gets underway , Martin offers EE the 'XB-68' design , and a development / production licence . This allows EE to get a head start on the other companies , so that a 'B-68' derivative , modified to British requirements , powered by British engines , and built in collaboration with Vickers , enteres service as the BAC Eagle B Mk.1 . . .
cheers ,
Robin .