Hi John!
First, I must say I'm not a Spitfire specialist, so I guess the real help will show up soon!
Anyway, I have two kits... well in fact three, that could match your request.
The first one would be Academy's Spitfire Mk XIVc (see below). It's a late Spitfire with a cool aggresive look. The kit comes with a D-Day decal sheet. The kit is from 1996 and seems to be of good quality even if the detail could be better on the cockpit sides...

The second one(s) is Ocidental's kit of the Spitfire Mk IXe. The boxing is also a D-Day one. Unfortunately I bought mine second hand and the decals were missing... the ones you see on the pics are from Aeromaster. The white sprues are an ICM kit of the Mk IX too. I bought once a "multi box" of three kits and the Spit was included. So an ICM Mk IX could also do the job.

As I said, I'm not aSpitfire specialist and you can expect more help soon! But I recommend you to buy a specific D-Day boxing. This way you could be sure the plane you'll build is accurate for the Normandy theatre.
Jean-Luc
EDIT: Hi Martin! I knew help was on the way!