Airfix also made two Astons in 1:24. The JB007 DB5 and a DB6. I think both were produced by MPC in America at some stage and that's the last we ever saw of them. Chances are good that the moulds are with round2, if they still exist.
And you could ask the same question about other British subjects (pun intended). No newer Jaguar was released after the Hasegawa XJ-S. There are hardly any Rolls-Royces, and not a single Rover. What was/is available in regards of Lotus cars is dismal as well, to say the least. And has there ever been a Bentley kit other than the 4 1/2 Litre Blower? MG lovers must make do with only two models, the Monogram TC and the Aoshima B. OK, we do have a Morgan Plus Four, but I bet there is a market for a Three-Wheeler.