Of course given a legal opportunity most people would take the not-pay-tax route. That's not the main issue. As for Cameron, sure the family may be avoiding some tax on some trust income but I was frankly surprised at the percentage of tax on "normal" earnings that the disclosed tax return show.
What I think pis
.ses people off most is the scams perpetrated by multi billion pound companies (Vodafone, Starbucks, Amazon & co.) whereby they artificially wipe out profits made in the UK by dodgy agreements to pay licencing fees etc to some Luxembourg counterpart, so the latter is taxed at 1% and the UK company never pays any, or any substantial, corporation tax whatsoever.
I directly blame the government for this. I'm no tax expert but they could do for these companies exactly the same as they could do for any company or taxpayer, look at their figures, and raise an assessment. Then, the taxpayer has to pay. Within 7 days. yes, they can appeal and go through the courts if they want, but they still have to immediately pay up.
If they tok it to court, what you'd then need is a judge who agreed with HMRC that "selling" the rights to your business name for $1 and then paying a $1bn (or whatever) annual licence fee for use of name is entirely a matter for you, and perfectly legal, but it's just that it's plainly an internal transaction between group companies and so we disallow the licence fee payment as a taxable expense. Job done.
It would be a laugh to read some justification as to why any commercial company would ever enter into such risibly uneconomic arrangements, save to wipe out a tax liability, and wiping out tax liabilities doesn't cut it as a qualifying ground to qualify as a legitimate expense.
Instead, we have situations like where Harnett the ex-boss in HMRC has cosy meetings and does sweetheart deals for past and future tax dodges, not even running them past government lawyers, and so Vodafone are sorted for years with little or no tax to pay, and the government has no appetite to set the dodgy deals aside.
Hartnett btw was the guy who agreed a tax deal with HSBC that gave immunity from prosecution for any crimes they might have committed relating to tax fraud in Switzerland. And then retired from HMRC and got a job advising on honesty and standards at ... HSBC.