Must admit I don't get the fascination with diecast.
You could commission someone to make the nice 1:72nd Airfix kit for you, and a competent modeller would produce a far better and finer detailed result than a diecast, with better quality finish and markings, a choice of individual aircraft, it would be much lighter, much cheaper, and delivered far more quickly than 12 months!
To finish to a good display standard from the box (comes with RAF ground kit as well),
Kit & paint £25 (can be found much cheaper, or kit supplied by you), build £40, total £55 - £65.
Or you could add detail like a vacform canopy and different decals, or convert to a Mk.V for say £80 total.
Certainly for the Corgi asking price you should be able to get a very finely detailled and nicely finished kit.
For £211 that one recent Corgi example has sold for, expect a scale rendition of the 1000 bomber raid!
So if anyone wants a decent model of a Stirling, Halifax, Lancaster, Hampden...