There is legislation legislation legislation with regard to tax law rather than education education education as Tony Blair used to say.The problem is finding out what the law actually is, for which you often need professional help. The law on common assault seems to have changed over the years without ever being reported in the media that I know about.
It's always annoyed me that these Russian shady oligarchs living in the London area don't seem to have to pay any more than £30000 in income tax after their corrupt privatisations in Russia, under some kind of law, or rule. It's pocket money for them. Multi-national corporations threaten to move to Ireland if they have to pay any fair tax. There seems to be some kind of rule that a millionaire can only spend a a short period of time in this country if he is to avoid paying UK tax. I don't think writers have to pay UK tax on their overseas earnings.
I have often thought there is the possibility of bribery and corruption when the tax people negotiate with certain individuals and corporations over their tax affairs. Meanwhile hospitals now seem to be unable to send the elderly to care homes because of all the spending cuts over the past few years, and the hospitals A& E can only cope with life threatening problems. Corbyn is in a weak position because he can always be accused of being loony left, which is a bit unfair, but probably true.