There are SO many opportunities for people to mix and spread the virus- they need to be limited much more ....
It doesn't seem like a long list of options to me besides closing schools. That I know of, those opportunities in Tier 4 are:
Harm would happen but Most easily could close/change these :
garden centres
zoos visitor
take-aways
estate agents
non-emergency veterinary care
some-construction
dog-grooming
some shipping, freight movements
chimney sweeps, routine electrical or plumbing work or redecorating
car-servicing, resprays
boat-building, river patrols
most manufacturing, including cars
lots of harm would result by closing/removing these
support bubbles
meeting one friend outside on your own
driving to take exercise, more than one exercise excursion/day
caring for a vulnerable person
removals, conveyancing, other moving house
most banks
paid pet sitting or dog -walking or routine care
some large non-private building routine maintenance activities
routine social worker visits
MoTs, new car sales, car hire
I presume no one says these mixing opportunities should just stop
large vehicle (eg bus) maintenance
emergency car repairs
emergency social worker visits
emergency trade activity (electricians, plumbers)
Post Office, courier collection points
corner shops
emergency veterinary care
logistics of internet shopping: pickers, packers, drivers
food factories
food shops
residential care homes
health care: hospitals or GP surgeries or rehab or hospices or palliative...
pharmacies
energy: gas supply, electricity generation
oil drilling platforms
agriculture, livestock care
zoo animal care
animal shelter care
experimental animal care (fruit flies & mice)
some large non-private building routine maintenance activities
security patrols
some construction
policing; criminal justice system, prison activity
house repairs
some shipping, freight movements
telephone/broadband network maintenance
public & hired transport: trains, buses, taxis