This simple premise seems beyond the grasp of the hard-line socialist thinkers.They already pay far less tax anyway (The lower earners). Higher earners pay far more tax. I still favour moving to a flatter tax system whilst simultaneously closing loopholes. Some earning £200k a year would pay far more tax than someone on £20k if they were taxed at the same percentage. And this isn't me tring to keep more of my money. I've never gone above basic rate tax in all of my employment history, but I think 'fair' should mean fair to everyone. Can't rich people be 'hard-working families' too?
I'm fairly liberal myself, and I'd prefer a flatter tax system, with more done to close loopholes.