This is about housing though, and whilst it would be nice to grow the economy instead you can then ask how? What with?
Historically our wealth was grown because of the Empire, we have no desired natural resources. As the Empire has shrunk, quite rightly, a lot of what we have left is housing. Manufacturing has been lost, we priced ourselves out of shipbuilding and such like, people don't seem to like well educated people anymore, even though the service industry is the biggest money spinner we have left, but we don't like that at the moment, our creative industry is also well respected but we seem to want the BBC shut down as well. Brexit has made the UK much more unattractive to invest in when you can invest across the Channel with a bigger pool of employees, resources and more attractive trading terms.
So housing is one of the only things that there is left to tax. It's not like the rich can hide a house or land like they can with other assets.
If you don't make money through importing, investment, tourism, or exporting it's just the same pot of money swimming around.