Capital gains tax should be the exact same as income tax. Same rate, same thresholds. We'll throw the rich a bone by allowing double zero rate allowances but that's it. Overnight the country's finances would be fixed and the vast majority of us wouldn't feel any impact.
@anon_opin Sadly, it's not quite that simple. I said exactly the same to my son, who is a government economist, and he explained in a depressingly persuasive way why it's probably not the answer — even though it seems morally right.