It seems they'd rather get the stamp duty from new build housing estates on agricultural land than protecting our farming industry so that we don't need to rely on others.
I'm so glad I live in the countryside, away from major cities and hopefully the mass riots won't happen - but if they do I hope someone points out to the people in power that they brought this all on themselves! 
Amen, HH. Nothing unique to the UK with that statement. When we purchased our land 20 years ago it was fronted with a dirt road. Now I live in a "housing estate" on a lot which ajoins my onetime country forest. The road is paved now. An autoparts place, insurance office, civic center, doctor's office, hotel coming soon and a score of other homes in this developement.
Additionally the concerns about mass riots are also not unique...there are concerns here also.
Many times I am flabbergasted that there are few people who know or want to learn how to grow their own food. Just a short distance from me is a family which receives assistance, has a nice yard...but in all the years I have lived in this area (off and on)...nearly 50...I have never seen them plant a garden. This is not unique to this family...our suburbs here in the USA are wastelands of former productive farmland which now only produce lovely grass and flowers.
So, there is little appreciation for the work that is involved in raising one's own food and therefore, as HH discusses, little appreciation for the land or the people who produce food on that land...