Gnome, refactor your model to reflect the reality of the situation with regard to benefits, allowances and taxes where 60% of the taxpayers take out more in benefits and allowances than they pay in tax. That is the situation in the UK at present. According to reports at the moment the break even threshold is £38,000 per year.

Income Tax represents a tiny fraction of HMRC revenue. The constant whine about taxing the rich leads ultimately to capital flight and you end up taking in less than you did before, the measure becomes self defeating.

By the way any time "fair" is mentioned, nobody ever states who decides what "fair" is.