Normally my vet charges £13 for a consultation plus the cost of any meds, which I think is pretty reasonable.
I once once charged £52 for an emergency visit at a different surgery, that was a bit of a shock...
However, the worst quote was what they wanted to spay Romy when she got Pyometra - £200! It was a terrible dilemma, she was so special to me but I just couldn't afford that. The animal charities I contacted in the hope of them helping out were pretty useless too to be honest, it was a sad episode