From Flight's library.

http://www.thescale.info/news/publish/Spitfire-stencil-details.shtml
I often check modeling sites when doing research, as these guys are as fanatical as you skinners, for perfection.
http://hyperscale.com/index_air_supermarine_z.htm
Regards Alan

Duggy

Indeed they are, Britmodeller seems to be a good one for anything, ummmm, British (http://www.britmodeller.com/).
In regards to the stencils, here's some more info: http://www.ww2aircraft.net/forum/aircraft-markings-camouflage/raf-markings-camouflage-9316-6.html. You'll need to be logged in to see it (near the bottom of the page).

I have never seen the rest of this Spit collection until now Wonderful photos.

Been lurking for a while but that looks like stunning work! Sorry I can't be more descriptive.. just amazing stuff!

Colin? Is that you?
Just checked your EMail.
How are you ? Glad you dropped in. Wow! It has been a while.
I still have your Email...Is it still operational?
Christopher