Agreed on the overroastedness of Starbucks, but I’m not sure I’d make that the reason for Starbucks’ failure to be a ‘market leader’ in the UK or Europe. To be honest, I’m not sure how one would define ‘market leader’ but Starbucks, unfortunately, has a fairly robust presence in the parts of the UK I’ve visited (like Sunshine, I prefer Costa and would seek that out) and has a global presence.
Interestingly, the reason for Starbucks’ closures abroad tend more often to be attributed to a clash in coffee or other cultures and less about the coffee itself. This also makes me think about the UK, where one considers cultural issues as well. Although something like 500+ Starbucks still sounds like too many to me. (Nothing to do with cups, just bleurgh.)