Yes the UK doesn't legislate for universal vaccination because the farming community don't want to. I've had this 'discussion' with farmers before and they get very hot under the collar about it. I've yet to find one who can actually provide scientific information that justifies their position. The assessment that this is the most cost effective method is let's say, not very rigorous. It's worth noting that the mainland EU do just the opposite, but the nthey can't pretend that 'the island is sacrosanct', which is what the UK's assessment seems to depend on, except roughly every 20 years it isn't.