I've used Tim Brazil a couple of times for consultancy/second opinions. He is very good and does travel a wide area. Get yourself a quote though as it's not a cheap option with mileage charges.
Depending on which area of Derbyshire you're in, the practise I'm with do (Pool House), but it's hideously expensive compared to taking them in- I was quoted double the normal scoping cost, so you're probably looking at £400+
For me it was cheaper to hire transport and take the horse in.