Presumably you watched it as I did and yes the title was 100% click bait, basically an hour and a half of my life that I won't get back 
Once I started watching, I didn't like his general attitude to a super wealth tax. However, I wanted to watch it so that I at least gave took the time to try to understand his ideas and consider them.
I did feel that his supporting arguments were quite weak, using outdated historical contexts and trying to pull on our heart strings with his personal anecdotes about his parents and grandparents.
In fairness to him, he did introduce others who had the totally opposite opinion, which added balance. But he seemed to think that rich people won't leave the UK if they're hit with an unexpected tax bill. There are only a small number (600 - 700k) of "liquid" millionaires in the UK. The vast majority have their Millionaire status tied up in their main dwelling. He is proposing taxing the rich, irrespective of how their wealth is constructed. And I make him right, those people won't leave, because they are tied down to a house / home where they have roots and they most likely won't have enough liquid funds or a way of making an income if they leave the country.
We already have a mansion tax, and that applies to someone with a house worth more than £2M, even if you are mortgaged to the hilt with low net assets. So it's true, the vast majority of paper millionaires just can't pack up and leave the country.
However, the very rich with lots of liquid assets are leaving as they see the writing on the wall. They're going to places like the UAE, Switzerland, Cyprus and Italy.
I do however think that everyone should pay their fair share of tax so the 1st thing to do would probably be to get the super rich and multinationals to actually pay what they should
I agree.
However, I find it distasteful the notion held by many, that by default the rich are greedy and unwilling to pay their fair share.
We need the rich to invest in the UK economy and infrastructure, after all, the root of where tax money comes from all starts with businesses. That said, we do need to look at the tax system and how individuals are able to extract profits from a business and pay very little tax.