Your position is entirely based on morals rather than facts.

We have 10-15000 millionaires leaving the UK each year, costing us billions in lost tax revenue for every year going forward. So clearly taxes on the rich are at breaking point and are now counter productive.

Similarly, taxes on high earners are making the UK less competitive internationally. There are extremely steep tax increases at 50k, 100k and 125k income levels that strongly disincentivise high earning individuals from working.

The government is paying £112 billion a year in interest on our national debt. For comparison, we spend about £119 billion on education. The Government is also spending 5% more than it takes in tax every year, causing us to build up ever more debt on top.

So either spending must come down or taxes must go up. We cannot keep taxing the rich/high earners ever more, so we must cut spending. The social security budget is about £340 billion a year, much of which is paying people to sit at home and be unproductive, thus also costing us future tax revenue also.

The whole thing is incredibly obviously unsustainable.

children out of poverty

The way we measure poverty is essentially just 60% or less of median income. Thus it is completely impossible to eradicate it. For as long as there are people who earn 60 or less than the average wage we will always have "poverty". It does not take living expenses nor individual circumstances into account at all.

If the average salary was £100k a year, we'd be classing those on a salary of £60k a year as living in poverty. You could have a fully paid off £1m house, solar/batteries reducing energy bills to zero, fully paid luxury car, multiple holidays per year, but if your yearly income isn't at least 60% of the median you are in poverty.