Sorry to muscle in on your forum.
I've just been doing a bit of reading, and have read that the UK imports around 80% of its pasta from Italy and maybe 50% of its rice from India. So assuming significant shortages of both imminently, there will be a significantly increased demand for potatoes and other British produce, combined with a shortage of migrant workers in the fields.
Am I oversimplifying? Or is all this already blindingly obvious to those of you who are used to planning ahead?