How much to get a tendon/ligament scanned?

have been to liphook with my friend today and her horse was scanned, she paid £250 but it did have something on the invoice about it being a discounted rate, she was expecting to pay £500!
 
Not a tendon but my boy was scanned for a missing testicle. The full thing including call out was £100. £60 for the scan (which took a good 30 mins) and £40 for the call out which is normal for our practice
 
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