Flaxmeadow Quoting directly from Hansard:
The high alert level reflects the interventions in many local areas at the moment. This primarily aims to reduce household-to-household transmission, by preventing all mixing between different households or support bubbles indoors. In these areas, the rule of six will continue to apply outdoors, where it is harder for the virus to spread, in public spaces as well as private gardens. Most areas which are already subject to local restrictions will automatically move into the high alert level. As a result of rising infection rates, Nottinghamshire, east and west Cheshire and a small area of High Peak will also move into the high alert level
I know that Hansard is but not sure what your point is?
It is local governments who are announcing which areas are in which tiers. But this is not finally agreed by central government
There is a tug of war going on between government and constituencies/councils/mayors etc in places like Greater Manchester and West Yorkshire. It's been in the papers all week
Boris wants more northern areas in tier 3. Liverpool have come out and said they agree to be in tier 3.
My point is, more could be in tier 3 by Wednesday. It isnt final yet because as Boris said, they are still in talks with those other areas