Interesting post James, I think that the predominant British coffee market, which is made up of the big chains sell quite a consistently poor quality cup of coffee, very generally speaking, this has resulted in the 'mis-education' of the average UK coffee drinker.
One of the most expensive business approaches, is the process of educating your customer, i.e making the customer understand why we, the "specialty coffee crew" (sorry couldn't think of another name), don't generally drink coffee from a big chain. I truly feel the indie market does not have the money and cash flow, to start that coffee education, yet.
I feel the role of SM in all this will be extremely significant. An indie business, with enough (hard earned) connections and respect, to perhaps be the catalyst for better coffee generally, educating the UK consumer, so that when another small indie business opens up selling just coffee, the customer knows what to look for..