I believe that 'winter warmer' was a term for the old Burton Ale, introduced to remove confusion with Burton Bitter, at Youngs at least.
To be more precise, Young's Winter Warmer is the new name for what used to be called Young's Burton, which was in the spirit at least of Burton ales. But these days "winter warmer" gets used to cover all sorts of things, including some spiced Christmasy beers. I'm not sure if "Young's" are still doing it, but Sainsburys do an own-label one that's brewed by the Eagle brewery so at least has some of the heritage to it.
Burton ales were 18th and early 19th century beers that have nothing to do with the IPAs that Burton later became famous for - they were darker, maltier, but still quite bitter. You see the distinction made in old advertising - mirrors etc, most people probably don't realise that they're advertising two different styles of beer :
The Wikipedia entry is not too bad :
https://en.wikipedia.org/wiki/Burton_ale
and it recently got an official BJCP description :
https://www.bjcp.org/beer-styles/17a-british-strong-ale-burton-ale/Popular in Burton before IPAs were invented, widely exported to the Baltic countries. After 1822, reformulated to be less sweet and strong. Most popular in the Victorian Era, with several different strengths available in the family. The strongest versions evolved into English Barleywines. Became less popular after WWII, eventually dying out around 1970. Some versions exist as Winter Warmers, Barleywines, or Old Ales, but the name has lost favor in the market.
Characteristic Ingredients
Bready and biscuity English base malts. Substantial portion of ‘high kilned’ malt. Historical versions often used brewing sugars and corn. More modern versions can use crystal malts for flavor and chocolate malt for color. English ale yeast. Traditional English hops, often dry hopped.
Style Comparison
Has some similarity in malt flavor to Wee Heavy, but with substantially more bitterness. Less strong than an English Barleywine.
Vital Statistics
IBU | 40 – 50 |
SRM | 14 – 22 |
OG | 1.055 – 1.075 |
FG | 1.018 – 1.024 |
ABV | 5.0% – 7.5% |