One of the things I always remind people about surveys is that they’re not really designed to give you a definitive ‘answer’. They’re more to give you an idea of scale and direction of travel.
Presuming that their sample was both representative and large enough, I would have confidence in their findings at a national level. Once you start drilling down below that, you risk having a more skewed sample from which you extrapolate results to make questionable estimates. The authors of this report have pretty much said so themselves.
Their findings on the national picture are worrying enough. We shouldn’t get too distracted by the minutiae.
The governments actions are purely dictated by PR/spin and the cowardice of BloJo. A national lockdown will be bad for their image so we'll end up with one by default pretty soon, everyone in a tier of some sort, but they'll try and spin it to save face.