The most left wing administration Britain has ever had was the Labour government of 1945 which had Clement Atlee as its prime minister. That government brought in the formation of the NHS, embarked on a huge council house building programme, Nationalised Britain's railways and Road Haulage industry, introduced the welfare state (no more half starved children dressed in rags in our streets) and introduced the nationalisation of the utility industries, along with much else.
The above measures prevented Britain from falling into another era of recession and mass unemployment similar to that which followed the first world war. The policies introduced under the heading of "Homes Fit For Hero's" and were targeted towards Britain's returning armed forces personnel with great success.
Those policies put forward by any party today would be viewed as extreme left wing by many in the media, with no doubt the words "Communist, Marxist" appearing in large headlines. However, those very left wing polices set Britain on a path of full employment, good average wages and affordable and readily available good housing that maintained the United Kingdom for more than three decades.
In the above it was the extreme right wing policies of the Margret Thatcher Conservative government that so damaged Britain in selling of those council houses, those utilities and ensured by way of her trade union legislation that resisting or reversing those policies would be impossible without major social disruption.
Therefore, it can be argued that it has been Conservative government policies that has brought forward the present housing crisis, low wage growth, the gig economy, gross inequality and lack of any social mobility.