The NHS is an infinite money pit, the more it does the more people want it to do and treatments and drugs get dearer all the time with medical progress.
Schools are almost the same, however good they are people want more, more one to one for children with problems, more one to one for really bright children, more sporting facilities for sporty children, more drama, more music, better buildings, more outdoor space, better teachers, better discipline.
And everyone wants higher wages, more benefits, better houses and a better standard of living.
There will never be enough money raised from taxation. You can't tax the poor, you shouldn't over tax the squeezed middle, you can't over tax businesses that provide the jobs or even the rich who fund the businesses that provide the jobs. If you put high taxes on pensions or IHT you risk more people falling back into reliance on the state and at the higher end moving wealth or themselves overseas.
I'm assuming in the budget tax relief on pension contributions will go down, capital gains tax will go up and changes to IHT to rake in a bit. Maybe a raid on savings or a windfall property tax, maybe phasing out of ISAs. I'm not sure any of it will make a dent in the funds needed for education and the NHS let alone anything else.