http://beefandlamb.ahdb.org.uk/market-intelligence-news/uk-lamb-trade-balances/
It is well known that the UK both imports and exports sheep meat throughout the year. This is to balance two things, the timing of UK production compared to domestic demand, and the carcase. For example, the UK imports more legs than it exports (including those on exported carcases), and more of these imports happen in the spring.
Brexiteers truly are thick.
You never know Galahad, maybe one day, far into the future, someone might invent a 'freezer'.