quite agree on the Liverpool point. Mixing the "mass" testing results into P2 was always going to send the positivity rate down, although I did not foresee quite the scale of the fall. I do think it would be better to report these separately, maybe the "mass" testing as pillar 5? 67 LAs had submitted an expression of interest in "mass" testing in their areas, not sure that has progressed yet however when it does it will widen the impact.
Given positivity rates are highly likely to play a part in allocating areas to tiers - assuming that is the way we go in England after the current lockdown - "mass" testing in some areas potentially distorts the picture.
Just to explain the use of " " in relation to mass, I think whilst testing has been ramped up in Liverpool given the timescales and actual numbers tested the use of the word "mass" is something of a stretch.