I see mine on the NHS Gail, so not sure what it costs privately - I think no diabetic should have to pay since it's one of our essential checks!
With me, they check the feet and ankles for pulses to check circulation, examine them for any problems, like ingrowing toenails or cuts, infections etc., and also test feet and toes for sensitivity (they touch it with a nylon strand when you have your eyes closed and you have to say whether you felt anything, doesn't hurt!).
If they decide you need any treatment then they should book you another appointment. If there is something ismple then they might deal with it there and then (like trimming toenails) 🙂