This has been a recent discovery: it's Innis & Gunn beer from East Lothian, Scotland. It's got an especially scrumptious taste- butterscotch, toffee, hints of vanilla, caramel. Despite the Victorian style label, the brand was only established as recently as 2003, and the "unique" brewing process was discovered by accident.
The beer is brewed at Dunbar, East Lothian, before being matured in American White Oak Bourbon barrels for thirty days, and then for a further forty seven days in a marrying tun. There's also a limited edition beer, matured in Navy Rum barrels.