I'm not able to post reviews but the first part of this wip will be a review so if any moderators would like to move it to the review section then please feel free!
For anyone who has built the excellent recent MkV, this boxing is very similar with many shared parts but also a few key differences. And for anyone who has built the rather disappointing Airfix Mki/ia/iia kit of a couple of years ago this is miles ahead in terms of detail and finesse.
One of the very interesting things about this boxing is that it contains many items that allow you to build a pre-war spit and far more satisfyingly than the previous release.
As you can see from this page of the instructions, there is a whole separate lower starboard sidewall and undercarriage lever for the pre-war option (option 'C' in the instructions). This could also allow for quite a nice and easy build of a prototype without too much additional work.
You can see these parts below:
And alongside the undercarriage lever is the early style pitot which is a very welcome addition:
Another very visible difference with the pre-war Spitfire is the lack of headrest and seat armour which is also addressed in the instructions: