I get unpasteurised milk from a local farm’s Milkbot. It’s delicious and I usually make kefir from it. The notices about organisms have to be posted at point of sale by law in the UK and the milk is basically sold ‘at the farm gate’ so you can see how the farm is operating and make your decision. The milk is also regularly tested - also on spec by the FSA. There is an online register of suppliers in England, and they seem to be gradually becoming more numerous - in the East Midlands anyway.