Around 10 years ago I went on a stag do pub crawl in Dronfield, NE Derbyshire. I couldn't believe my luck when the first pub we went in , The Sidings, had Brains Dark Mild on offer at 50p a pint.
Apparently they had had a beer festival the previous weekend and had a barrel and a half left over.

Needless to say we crawled no further than The Sidings and I made a few converts of people who had never tasted Dark Mild. As Wheeze says, delicious stuff if kept well.