Oh my goodness, a vet wants to examine animals before prescribing prescription-only drugs for them, in accordance with the law - what a fucking outrage! 
Seriously, if you went to your vet with your cat's broken leg and they said "we'll x-ray this but it'll cost you £500 per plate" you'd be on here moaning. But it's the profit from drugs which fund the massive capital needed to buy and subsidise proper equipment.
I used an ultrasound machine at work. It cost £10,000. I charge less than £40 (inc vat) each time. Factoring in my time, which I bizarrely expect to receive a wage for, how long do you think it takes to break even? Then there's the digital xray, twenty grand of laboratory equipment, autoclave, ultrasonic scaler, pulse oximetry, anaesthetic machine, endoscope, etc etc.
You want a practice with the necessary equipment to treat your pets? You want staff who have appropriate training and experience? Then you don't get it for free.
Urgh. People who are unreasonably tight about their pets drive me insane. Struggling to find hundreds of pounds to pay for treatment of an injured pet after a car accident? I have all the sympathy in the world. Resentful about paying for professional preventative care? Sorry, I'll just think you're a twat.