I think there are many collectors of 1/43 die-cast models, particularly the UK 'classics' that seem unlikely to be released from Corgi/Oxford who would have a crack at building some 'Airfix' 1/43 vehicle kits. Victor FD series, MG Midget/Austin Healey Sprite and a Bedford CF van would be interesting. Could probably make them pre-painted and/or minimal assembly with a one-piece body if that made them more attractive to the casual buyer
I really hope they might venture into making some cars (and maybe commercials) that probably won't make it to the Vanguards die-cast range, a Victor FD series and Zephyr/Zodiac IV for starters please
The usual !! Manchester, Sea Vixn FAW.1 and 2, Javelin, Albacore and any of the old and more obscure FROG kits with a UK connection.... some 1/43 classic British cars and trucks too please :-)
I always look at subjects that fill some gaps for the UK in particular so I think along the lines of the Avro Manchester, Supermarine Scimitar, DH Venom and maybe something a little unusual such as the SA Twin Pioneer in 1/72. Would also be nice to see a Hastings, Beverley (and Belfast !!) but what scale ??? :-)
The RL / S type seems an obvious choice and it remained a bit of a mystery as to why it had never appeared as a modern 1/72 or '00' offering that could be mated with various options. There is a die-cast RAF liveried model scheduled to be released in 1/76 scale for 2021/22
As mentioned by many before (including me !!), I think a 1/72 Avro Manchester and Supermarine Scimitar would be excellent subjects for Airfix. A scaled down Sea Vixen and Javelin in this scale would also be most welcome. Maybe some classic British vehicles in 1/43 would be an interesting addition to the range too? I'd also like to see a Bedford S/R type with various options in 1/72 / 00 scale