Yup, built a number of these, and am currently doing one for the "Aces" GB.
It goes together pretty well. With a couple of caveats:
1. the instrument panel will need to be filed/sanded on the left (port) side of the gunsight, or the fuselage will not close properly around it. The problem area is mostly around the curve from the top down the side. ( The photo below is the cockpit from the old, old Airfix Spit, on the left; new cockpit on the right. New mould is much improved!)
2. The wing to fuselage joint is too tight. If you glue the top and bottom of the wings together, then try to mate them with the fuselage, the assembly will not quite fit. The problem seems to be on the right (starboard) wing. I filed things down on the fuselage wing root to make the assemblies fit together. On the other hand, the join is so tight, you might not need to use filler. The photos above and below are not from my current Spitfire;they come from the "Spitfire" GB a couple years ago.
3. The rear edge of the clear canopy will need to be filed down a little to get it to fit right. It's just a hair too big.
4. There are a number of places on the inside of the fuselage, where ejector pin marks need to be filled and sanded.
Here was my finished product.
I love Spitfires.
If I think of anything else, I can post it. In the meantime, you can check the "Aces" GB. Right now I'm at the point of attaching wings to fuselage, but haven't posted photos yet.
Here's a link to the page where I started.
http://cs.finescale.com/fsm/modeling_subjects/f/29/t/163108.aspx?sort=ASC&pi240=9