I believe it pointless to cover models that are already admirably covered by recent mouldings by rival companies or easily converted from existing after market parts.. Airfix are simply not the only gig in town. With this in mind..
1/350 HMS Queen Elizabeth (carrier).
1/350 HMS Ark Royal or Eagle (Audacious class, final fit)
1/350 HMS Victorious ( Carrier, final fit)
1/24 Sea Fury.
1/72 Vickers Varsity, Anson, Valetta, Beverley, Pembroke/Sea Prince, Newer Dove, Sea Balliol, Scimitar, Sea Vixen FAW1, HP42. Buccaneer S1, Lincoln, Hastings.
1/12 Bentley Blower (an excellent kit in its day), to be updated to Italeri standards as in their recent Alfa Romeo 8c. ( Fabulous kit).
1/12 of any 1950s British F1 car.. any of them.. Vanwall, Lotus, BRM, Cooper, take your pick as nobody else does one pre 1960s or post 1920s .
Reissue of SRN4 with an unwarped roof.
I am betting on..... not one of the above.