WWII fighter bullet proof protection I.D.?

[30Three]

One of my clients owns a Mk19 photo reconnaissance Spitfire; he also has a Sea Fury. He still flies both at events around France and Europe.
There are a lot of videos on youtube of his collection. Having the chance to sit in the Spitfire when visiting the collection a few years ago was a schoolboy dream come true!
Some links for those interested. First link is the first Spitfire flight for one of the Breitling Jet display pilots.