So what’s the economic or political answer to ‘rents’?

This evonomics article points out the harsh truth that LAND value increases in the UK are largely what’s responsible for most of the economic ‘growth’ there. (Read the piece!) After reading it, I understand what the author sees as a problem in that ‘owners’ are getting an unearned windfall while those that don’t own land are being screwed. But what is the economic, in this case actually POLITICAL, answer to this ‘problem’?  I’m not sure there is a way out of this trap.  Capitalism often has to be ‘saved’ from the capitalists by politicians, but this time the capitalists have made damn sure they own the means of ‘politics’. Who’s going to save capitalist from themselves this time and how?