Cameron is quite definitely a 1%er, rather than a 0.1%er.
More importantly, he is married to the daughter of a Baronet, and is the cousin of a Baronet too, so, socially, very firmly a 0.1%er.
One of the other issues with money is that most of the people even those who are just in the 1% have to work to live, if you have access to sufficient finance to not worry about needing a job for the rest of your life one could argue that it's a problem. Even if you take out 100% of the money out of politics it's not going to be enough, because those who do not need to work to survive can invest 100% of their time into politics and driving their agenda forward while the rest lags behind.
Now I'm not arguing that there is a solution for it, but what people tend to focus too much is on flat sums and income inequality which is almost futile. You might dislike some one who's making 160K a year but in most cases they are just like you if they do not work they'll find them selves on the street just as fast (and sometimes even faster than you). So for the most part I discount those who work directly for their compensation from the so called "1%" while you might think that some CEO getting payed 700,000 is some wallstreet arsehole, the oil worker in Nebraska might think the same about a developer in NYC earning 300K a year.
True wealth allows people to focus on building dynasties and true power and if you want to focus on anything you might focus on that, that said we are 65 there's a good chance that we'll be considerably less supportive of things like inheritance tax when I'll have children and grandchildren to worry about.
PS: These numbers get crazy. I know a couple that has a little under 20 million, but don't quite think they have made it based on who they hang out with. And honestly there goals don’t seem that ridiculous. ~200k each after inflation from a diversified and conservative portfolio which will just snowball takes a lot more now than you might think.
In fact, there are probably legitimately influential people that wield more power than those much richer to them. One need only look at political "movements" to see that they're not always run by the rich and powerful. But rather, by those that can get large amounts of individual/normal people to agree with them and follow through. The oratorical figures, I'd say.
He has been saying (and publishing tax returns to show it) that he doesn't own any shares any more. And even when he did the amounts being talked about are in the hundreds of thousands range. Was there some new revelation in the past 24 hours that revealed Cameron to be a secret millionaire?