I can testify that if you push the limits of WLP007, it will be very attenuative. I brewed a beer that went from 1063 to 1010 (92% Maris Otter, 4% C-75, 4% carapils and mashed at 147F). I was trying to hit 1012. The beer turned out great, but even drier than I anticipated.
For this reason, I doubt that they use a pure strain of 007. If I was to brew this, I would stick with 002.