They are still out there, but slowly disappearing, I find stuff in far flung shops when I'm visiting places like IOW, Weymouth, places like that, I got some very nice uk stuff in a shop in Glastonbury 3/4 years back, sadly now gone...
London is pretty crap now, certainly oxford street area, not what it used to be...
charity shops have deals with local rock n pop dealers I find, so anything is worth anything gets creamed off, boot sales and markets are one place you can still occasionally find stuff, but let's face it, it's slender pickings...
stick to the shops like Beatin rhythm, soul brother, soul jazz etc, as they do carry original stock, soul jazz is crap for Northetn btw....
The Diskery was always good when I lived in Brum, haven't been in years... I guess you will get good us originals, but it will be ballads etc, you probably won't find collectible northern I'd think
not as fun as it used to be eh...
mal