That is the problem, you can only buy what is stocked in your local corner shop. I remember during our Brewing module at university finding out that most good beers should be not drunk more than a few miles from where they are brewed, as that is when they are at their best. One reason why micro breweries have become so popular..
The other is they actually care about the brewing process, don't save on ingedients, and are not afraid to produce batches of same beer with a tad different tastes.
I don't know about the Scottish situation, but the difference among industrial and craft brews here in Czechia is huge.
Same in most countries I think, what gets exported is the mass produced stuff with cheap ingredients. Local craft brews often use the best ingredients, but they cost, and I know with the cost of living still going up no matter what the government says, I have noticed some craft breweries shutting down as they can't go on.
Fortunately, beer is too important to us to let the craft breweries shut down :) Quite the opposite - they keep booming here :))