The unions seem to be living in lala land. Where do they think the money is coming from? There are not enough "rich" people to raise much money from increasing taxation solely for them. Plus, how much do the TUC think they should be taxed? 70%? 90%? If taxation rates go too high, people stop bothering to earn more money.
We need to increase the wealth creating sector of the economy - which is business, and in particular small businesses, by reducing Corporation Tax, and overhauling the iniquitous business rates system. Reducing red tape would also help here.
In the meantime, the public sector needs to become leaner. Everyone can furnish examples of dubious public expenditure from their own experience. Managers in the public sector need to be rigorous in rooting it out. Alot are too complacent: "Oh, I've got the budget for it, so I can spend it" rather than "do I really need this?"
It should also be as easy to sack incompetent public sector workers as it is in the private sector, without the interference of the unions. The public sector can't afford to carry dead weight any more.