Low flying Spits.

Also the PR XIII, which was an armed low altitude reconnaissance aircraft

Ventura Publications, they have several youtube videos, one is about early mark photo recon Spitfires. 

I found the mechanical innovation and ingenuity in getting huge amounts of fuel, oil and camera’s into a small airframe incredible.     

I was under the impression that, for example, the FR.XIV was fitted with cameras for low-level armed reconnaissance? Same went for the early Allison engined Mustangs in RAF service. 

Reconnaissance would be PR, not FR.

According to Wiki, Castle Bromwich built 15 Mk.Vs as PR Type F.

Personally, I’ve never heard of them…