From howtobrew.com:
Cooper's Ale (Cooper's)
All-purpose dry ale yeast. It produces a complex woody, fruity beer at warm temperatures. More heat tolerant than other strains, 65-75¡F; recommended for summer brewing. Medium attenuation and flocculation. Attenuation: 73-77 %
Nottingham Ale (Lallemand)
A more neutral ale yeast with lower levels of esters and a crisp, malty finish. Can be used for lager-type beers at low temperatures. High attenuation and medium-high flocculation. Fermentation range of 57-70°F.