I'm with dordway29 on this, and it has become my favorite.
It won't disappoint!
YEAST STRAIN: 1968 | London ESB Ale™
A very good cask conditioned ale strain, this extremely flocculant yeast produces distinctly malty beers. Attenuation levels are typically less than most other yeast strains which results in a slightly sweeter finish. Ales produced with this strain tend to be fruity, increasingly so with higher fermentation temperatures of 70-74°F (21-23° C). A thorough diacetyl rest is recommended after fermentation is complete. Bright beers are easily achieved within days without any filtration.
Flocculation: Very High
Temperature Range: 64-72F, 18-22C
Alcohol Tolerance: 9% ABV
Or White Labs....
WLP002 English Ale Yeast
A classic ESB strain from one of England's largest independent breweries. This yeast is best suited for English style ales including milds, bitters, porters, and English style stouts. This yeast will leave a beer very clear, and will leave some residual sweetness.
Optimum Ferment Temp:
Enjoy your brew(ing)!