You have a common law right to pass and re-pass along a public road. If you're parked up, you're neither passing nor re-passing. It's not strictly banned, but it's not strictly lawful either.
Wouldn't it be littering?
As for pavement parking, it's not lawful in London and everyone survives.
Driving on the pavement is illegal unless it's crossing it to enter a premises (like a driveway)
I think there is a common misconception that by taxing their car, drivers are buying access to the road. What they are actually doing, if I understand correctly, is paying a penalty for the damage that their vehicle will do to the road. This sounds similar on paper, but is a important distinction.
There's an awful lot of misconceptions about driving laws. And laws in general. And politics in general.
There are two main 'road related taxes'
Vehicle Excise Duty - charged on a vehicle no matter how many miles it does based on its CO2 emissions. A 500g/mile car driven 100 miles a year attracts more than a 50g/mile car driven 100,000 miles a year. Crazy system.
Petrol tax - charged on petrol usage, so a 30mpg car pays more than a 90mpg car.
Those taxes are nominally linked to polution, not to damage, even if all vehicles traveled the same amount.
There are other road-related taxes, including VAT on road related items, as well as occasional tolls.
Funding for roads is almost entirely from national government funding (mainly things like income tax, national insurance etc), or from local council funding (mainly buisness rates and council tax).