Taxing the wealthy is the only way to redistribute wealth. It's no good telling them to sell their assets, some other wealthy person will just snap them up.
We need a taxation that looks beyond salary income into overall returns on investments and property (including art/car collections etc). If total growth in wealth is over £10m then apply a 2-5% tax on it.
We also need the government to start funding itself. By this, I mean to say not to be 100% reliant on income tax, VAT, Road tax etc. We need the government to own nationalised assets like Rail and Energy. Things that turn a profit, basically. We also need house-building to really kick off across the country - only a tiny (circa 10%) fraction of the country is built on.
Combining these approaches means that not only will the Government be able to fund projects, but it will be able to lower the income tax burden. Kick starting a huge house building programme will stabilise house prices for the next generation and therefore will allow the population to build wealth for themselves (property, savings, ISAs etc) and maybe even start to create generational wealth.
Obviously productivity is an issue. Both productivity and salaries have stalled in recent years. The Government really needs to unblock innovation in the UK in order to get this moving.
It's a bit of a mess to say the least, but should be doable if the country gets out of its own way.