A somewhat different and extended list from normal due to a St David's Day jolly in the Black Country.

Batham's Mild 3.5%
Holden's Black Country Mild 3.7%
Holden's Black Country Bitter 3.7%
Vale Red Kite 4.0%
Upham Punter 4.0%
Titanic Iceberg 4.1%
Hopstuff Fusilier 4.3%
Batham's Best Bitter 4.3%
Holden's Golden Glow 4.4%
Hopstuff Pale 4.5%
Lancaster Black 4.6%
Burton Bridge Top Dog Stout 5.0%
Clarence & Frederick's Oatmilk Stout 5.0%
Twickenham Black Eel 5.0%
Dark Star Festival 5.0%
Westerham Azzurri Double 5.0%
Brodie's Old Street Pale 5.0%
Holden's Special Bitter 5.1%
Mantle Dark Heart 5.2%
Hopcraft Citraic 5.4%
ELB Quadrant Oatmeal Stout 5.8%
Sarah Hughes Dark Ruby Mild 6.0%
Hopcraft Long Nines Stout 6.0%
Brodie's Chinook Bacon IPA 6.0%
Holden's Old Ale 7.2%

There are quite a few contenders but I'm surprising myself by nominating the lightweight Holden's Black Country Bitter as tried in the rather poncy Fellows in Dudley for £2.75. It was in perfect condition and I just don't remember this beer being that good.

BOTW Holden's Black Country Bitter