To be serious for a minute, Boris did seem to say in the HoC that he wanted more areas to be Tier 3 but the local leaders were putting their foot down
Which is where leadership comes in and having a clear, definable equation that sets the levels based on the scientific data matched to clear restrictions at each tier.
We've got cases per 100k, R rate, positive test %, hospitalisations and percentage of capacity etc - all of which could be used to set an automatic tier level. Doesn't then need govt or local authorities arguing over what should or shouldn't be done. It's all there already.
You could try and add them all into one equation if you wanted although that makes it complicated and puts people off. So instead you could take each criteria and set a tier to a figure for it.
i.e.
R rate
Tier 1 - 1 or below
Tier 2 - 1.1 - 1.4
Tier 3 - 1.5 and above
Cases per 100k
Tier 1 - under 250
Tier 2 - 250-500
Tier 3 - above 500
Hospital capacity
Tier 1 - under a third
Tier 2 - under two-thirds
Tier 3 - above two-thirds
*these are examples - proper figures would be agreed with the relevant scientists and experts to prevent transmission.
Then the tier for each area is set based on the highest tier from all these, so if you're tier 1 on all criteria but tier 3 in another, you're in tier 3.
It's clear, indisputable and sets out what will happen at defined points. Of course people would be annoyed by it but I reckon we're far more likely to be accepting of it if the criteria is plainly set out and what each tier means in terms of restrictions.
It's the constant arbitrary decisions with exemptions for some things and not others not seemingly based on any evidence whatsoever that riles most people. Have the balls to say "these are the criteria for each tier, these are the restrictions that will be imposed for each tier, no exceptions"