Model Aircraft Decals

I am trying to build a model airport and I want to make it unique and make my own decals for the aircraft. Also, any ideas on what plane I'm using (I'm adding the Hawker Hunters to date), it is set in Africa and will be 2.5 m by 1.5 m

You can buy sheets of sticker paper and print to use on your computer. Here's a link: http://www.decalpapers.com/
I used it on my HO scale trains with excellent results. Remember to use a sealer after clear-down to hide the edges.
How a Lancaster bomber and a few hurricanes if you WW 2.

Why not contact Airfix ... see what they can send you ...