Found a link to this 2014 podcast by Professor Paul Rogers, from Bradford University, whose approach to security is different: Human Security and it is a broad brush analysis - which includes the role of food.
Link:http://www.tansey.org.uk/news/PRtalk.html

Food production and climate change starts at 14:54. To be fair the more I listen, it is interesting and just about fits here!

Since 2012 there have been a small number of posts on the purchase, development and sometimes using imported labour on agricultural land. IIRC with China and Saudi Arabia to the fore.