There should be a hike in road tax to £200 per year for all cars - none of this £30 for low emission vehicles.
There are over half a million second homes in this country. There should be a huge increase in council tax on second homes.
Also far more council tax bands should be introduced - it's ridiculous that someone living in a fairly standard house on a a suburban estate should only be paying £1000 less council tax than a mansion on acres.
There shouldn't have been a property built in this country in the last 10 years, whether commercial or residential, that didn't have renewable energy options included in planning requirements, whether that be solar panels on the roofs of every single Persimmon/Bellway etc etc home built, or on the roof of every warehouse, office block, Tesco superstore, or heat pumps, wind turbines etc.
It won't win votes but I would be seriously looking at capital gains on first properties. If we had 10% capital gains on property, it's not really hurting anyone. See also inheritance tax - should be 10% across the board and higher rates for estates of £1M+, £10M+ etc.
Close tax loopholes which allow tax avoidance, whether this be the likes of Rees-Mogg and Sunak with funds stashed offshore or Amazon paying miniscule tax here on their huge UK profits.
Tax overseas investors who buy up UK property with zero intention of ever living in it.
NHS needs a total overhaul from the ground up. Too many staff. Too many patients who with earlier intervention wouldn't be over utilising the system down the track.
Education also needs a complete overhaul. Bring back Sure Start to ensure those who need extra help are supported from the beginning of their lives.