Approximately 50% of Spitfire Mk XIVs had cameras, it was certainly not designed for P/R. Tactical recon and P/R is not glamourous but demands a high performance aircraft to go in, take a picture and get out again, until the picture is developed the mission is a failure. A number of P-51s were used for P/R for the very good reason that they were good at it.From what I understand, the first Mustang I did not have cameras, but subsequent production models did. The first Mustang I was used for trial fitting of equipment, and its performance tested. As Pbehn says, the lack of altitude performance saw its roe changed to tactical reconnaissance.
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