I am sorry to hear that you did not find a decent curry in Glasgow, but it I would expect as much. I'm just outside of Glasgow and in my town there are only two places out of dozens that are worth ordering from. I find your comment about ginger spot on. In the two places I buy from the chefs are a lot older than in most places, perhaps just more experienced or more old school I dont know. It does worry me that when these chaps retire I won't know where to find a good bhuna within ten miles of my home.
I gather though that I am not alone and would bet most members here would say that, regardless of where they live, it is getting increasingly difficult to find a good curry.