I used Wyeast 1275 a few times in a British Brown Ale, the last time in 2019. Mash efficiency was in the high 80’s each time, fermentation started off strongly in less than half a day and slowed down to almost no airlock activity after 3 days. Fermented at 67 degrees; gravities were on the money. I liked it and would use it again.
In comparison, I used WLP-013 London Ale in my last batch of brown ale. I used it because I couldn’t get any 1275 at the time. The mash efficiency was 81% and the final gravity was off by only 1 point. It started slightly slower, and was essentially done fermenting in a week. Fermented at 66 degrees. I’d use the Thames Valley next time.
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