I hate to say it, but...
Do not assume that meat you buy in your local butcher's is local or even British. Even if the butcher has signs up saying that he buys local, even if his chalkboard says that This Week's Lamb is from <farm name>.
For each meat that you buy you need to ask the question.
Our local butcher, who buys his lamb from us when we have some and tries his darndest to source local native breed beef, buys in local pork and homecures his own bacon. All well and good
. But, as well as his homecured bacon, which
is locally-produced pork, he also finds he has to sell a regular bacon, cheaper than the homecured. Guess where he has to buy this. He hates having to do it, but the fact is, he cannot find a regular supply of vac-packed bacon from within Britain of a quality he demands at a price his customers are prepared to pay.
If you ask the question directly, you will be told the truth, but he doesn't advertise the fact that the cheaper (but still excellent) bacon which is not homecured is not British either.
I and other equally careful customers only buy the homecure, but the majority buy the other sort regularly and the homecure as a treat. Both are excellent, but the homecure is very special
I don't think they come much more genuinely passionate about local meat supply than this butcher, so if he finds he has to source some of his bacon from the continent, I think you have to assume that many other butchers are having to do similar.
The moral is - always ask, even in your local butcher's.