As a shorthand description of a much more detailed policy, I am all in favour!
Always, in times of austerity and crisis, the 'rich' have continued to get richer rather than poorer, while the 'poor' have got poorer. I think we have to find a way to prevent this.
Trickle down has been dismissed by most experts, as it is clear that most rich people don't buy more, start more businesses etc. with their excess riches; rather they are able to afford to have ways found for them to place money in the most lucrative places. When poorer/middle income people have more money in their pocket, they are much more likely to spend it, boosting the economy, or use it to start businesses, so employing other people.
I know tax avoidance is not illegal at the moment, but I think it should be if possible. I also think there should be restrictions on bonuses and other means of avoiding income tax. Surely MPs have the brains and ability to find ways to do this? And a wealth tax of some sort.