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My various points are that changes in consumption models, driven by broader technology trends, in the context of publishing space that has been struggling for market share as they compete against a burgeoning choice of entertainment options and rising retail space prices may form a larger part of the issue. The drop in exchange rate might have been the final straw for the camel, but the final straw is not wholly responsible.
I was responding to your point that it was likely due to new methods of consumption rather than a collapse of the pound due to Brexit. I.e.:
If your point was about renting costs in London, I happily concur that this likely makes it tough for any independent shop.