The problem in UK cities has nothing to do with feudalism. The massive lands most of those big land owners own isn't really worth that much. The really valuable land around cities is locked up by 1960s land use and building regulation. You have incredibly valuable land not developed because it has to be 'green' but its not some ancient woodland, rather its just a bunch of grass next to a highway.

Those 1960s regulation have a 1000x larger effect then any land owners owning a bunch of unproductive farmland or highlands.

Not to say there are no issues with large land owners, but its nowhere near anywhere close to being the issue with housing prices and living cost.