It is from their private collection and only offered once every few years. Specs and description from the Wyeast web site:
Wyeast 1882-PC Thames Valley II Yeast
Beer Styles: Ordinary and Special Bitters, ESB, Northern English Brown, Robust Porter, Dry Stout, Foreign Extra Stout
Profile: This strain was originally sourced from a now defunct brewery on the banks of the river Thames outside of Oxford, England. Thames Valley II produces crisp, dry beers with a rich malt profile and moderate stone fruit esters. This attenuative strain is also highly flocculent resulting in bright beers not requiring filtration. A thorough diacetyl rest is recommended after fermentation is complete.
Alc. Tolerance 10% ABV
Flocculation High
Attenuation 72-78%
Temp. Range 60-70°F (15-21°C)
You should be able to enter it into your ingredient profile using the above information.