that, plus:
Inheritance tax needs sorting out for the same reason. I have a bit of a grudge that because I'm from the north I'll inherit a £100k house, but someone from the south would inherit a £350k house. I understand the desire to leave something for children but in no way can that situation be considered just. Plus... there's the people who benefit from inter-generational wealth to the sum of millions (or even billions), they blatantly aren't paying 40% tax on it.
I also think there's scope for a carbon tax. And unhealthy food tax. Probably more if I really think about it. Quite clearly plenty of sensible ways to raise tax without it having to be me.