Amusingly, my now passed ultra-SNP uncle spent a lot of his life bemoaning the replacement of the contemporary beautiful Scottish desert with huge tracts of monoculture pine trees, changing the expected beauty of Scottish landscapes with tens of thousands of dense rows of trees planted 'for the English', in turn making another form of desert. He was right in that it wasn't pretty and not much of an improvement on a [human-] degraded landscape, but I always thought he should've looked a little closer to home to see who was profiting from all that stock. It was likely his neighbours (perhaps English), not London per se.
Does that self sufficiency translate to lower prices?