Hello Nick and Everyone.
Many thanks for your question. I guess I should have clarified all of this earlier.
Firstly, I had no idea that any of the updated BSP1 and 2 text and info had pulled in items from BSP4. All I did was revamp the old titles and add what new information I had here, so I apologise if I might have stepped into some of Chris's territory (the top man for hypersonics and missiles of course, and so much more).
Second, yes the split WW2 volume will be BSP3 Fighters and BSP4 Bombers - that was a Crecy decision made quite some time ago now. This numbering sequence does not take in to account the original Midland Publishing editions.
For 3 and 4, again I will add what new information I have, with I hope plenty of new illustrations. But I have no intention of expanding the parameters, which were essentially to cover types that were designed and developed during WW2, or in the second half of the 1930s with the knowledge that war was coming. I will not go back to say 1930, which to my mind takes us into an area that demands a separate volume.
As far as I know Crecy have no plans for a BSP6 and BSP7, or if they have what subjects they might cover. I guess there is scope for a volume covering British fighters and bombers say from 1920 to 1935, but I have no wish to do that myself. When the revisions of BSP3 and 4 are done I think I will have had enough! However, if anyone would like to offer further volumes in the series (and of course if Crecy decides to take them on) then I would be only too pleased to give all the support and help that I can.
Very best wishes to you all. Tony.