New Zealand can produce lamb much cheaper than UK farmers can and deliver it into the UK frozen at half the price. It is a win win for UK consumers but a disaster for Welsh and Scottish sheep farmers.
The government will no doubt bring in measures to strike a happy medium.
Unless an FTA has been signed, the WTO tariff on sheap meat is 45% or thereabouts. I've heard slightly different levels, which may depend on various factors.
I'm wondering if this is the link that I couldn't find earlier.
Tariffs on UK-EU exports under WTO rules
14.Individual tariffs vary between different sectors and products. For non-agricultural goods, the average tariffs are relatively small. However, tariffs on agricultural goods are typically much higher, with the intention of protecting domestic markets.
15.The average EU tariff on dairy products is over 30%, while tariffs could be as high as 87% for frozen beef. Some other examples include a tariff of 46% for cheese or 21% for tomatoes. Some individual products have tariffs over 100%.5
16.Witnesses told us that tariff-free access to the EU was “crucial”.6 Tariffs would have a detrimental impact on those agricultural sectors that were dependent on EU exports for their profitability.
17.We heard particular concerns about the impact of tariffs on the sheep sector. The EU is very important for UK sheep meat exports, with more than 95% of its export volume destined for the EU. The Welsh lamb market is very dependent on the EU market, with 92% of exports (by value) and 85% (by volume) destined for the EU.7
18.Sheep exports, with a tariff of at least 50%, would become uncompetitive on the EU market.8 The Agriculture and Horticulture Development Board (AHDB) told us that this would have a “devastating” effect on the sector.9 The Andersons Centre estimated that in Northern Ireland alone, exports to the EU would drop by about 90%.10 It would have serious consequences in Wales, where sheep farming was such a vital part of the Welsh economy, with producer prices estimated to decrease by 30%.11https://publications.parliament.uk/pa/cm201719/cmselect/cmenvfru/348/34805.htm