EMU Analytics have shared a number of interactive maps on their Location Insights Explorer.
The Christmas Dinner interactive map visualizes where your Christmas dinner ingredients come from and also allows you to compare their 2018 agricultural production to that of 1945. You can therefore use the map to see if the areas associated with different livestock and crops has changed since World War II. You can also how their production has dramatically increased. For example in 1945 there were 1.6 million pigs. There are now 3.9 million pigs in England.
One thing that the map clearly reveals is that farming is much more intensively concentrated in certain areas today. Back in 1945 the farming of potatoes, pigs and turkeys was fairly evenly distributed across the country. In 2018 there is a less even distribution with livestock and crops being grown much more intensively in specific areas of the country.