Sounds like they wanted you to join one of the schemes... The SAC accredited scheme requires you to test 3 times every 6 months before you become accredited, then you only test twice a year.
The BGS has negotiated cheaper lab fees with one lab in particular, so it does provide a bit of a discount (not much though!).
Our bill still works out at about £14- £15 per goat, once you add in the vets fee's and call out charges.
Beth