I just recently completed a lot of Yakovlev fighters for upcoming Polish Wings updates and felt that for a while I need a bit of rest before I proceed with further related stuff, so in the meantime I decided to make this small addition to this great thread (using the fact that it's based on my earlier works and so can be done relatively quickly and easily).
Late in the WW2, Fighter Command showed great interest in obtaining airborne early warning and fighter direction capability (called AWI - Airborne Warning and Interception). When the Boeing C-97 has been built, it was considered a perfect platform for the planned sizeable installations. However, in the climate of the immediate-post-war austerity it was far too expensive idea and designers had to satisfy themselves with GAL.58 Hamilcar as testbed.
Great Britain, Boeing Stratofreighter AEW (AWI)
Much later, in late 1970s and 1980s, during the ill-fated development of the AEW version of Nimrod, BAe designers thought it would be a good idea to use more capable platform instead, specifically Airbus A.300 or A.310 (which British Aerospace was co-producing). Resulting designs were BAe.844 (A310) and BAe.847 (A300), that were also part of the super-tanker project to meet ASR.411 (that itself came to naught when TriStars were acquired in 1982).
Great Britain, BAe.844 (Airbus A310)
Great Britain, BAe.847 (Airbus A300)
For more details look:
Chris Gibson, The Air Staff and AEW. Royal Air Force Early Warning Projects, ProjectTech Profiles, 2013;
Chris Gibson, Battle Flight. RAF Air Defence Projects and Weapons Since 1945, Hikoki Publications, 2012.