There are many SLR cameras these days selling for $150 US. But you do understand an SLR camera does film, not digital. For that you'll want a DSLR camera (D=digital).

I shoot and recommend Canon. I have two of their dslr cameras and love them both. At the bottom

of the Rebel heap is the t3, about 350 of your pounds.

Your best bet is the (discontinued) Nikon D3000 - Argos is selling off its stock at silly prices.