What good can they do in opposition?If they didn’t have left wing policies, they wouldn’t be doing the good I want from them.
How about they go centre left and then they may actually get to put some policies into effect that are closer to your wants than a Conservative govt? If they hold onto their current path then you will be stuck with a Conservative govt for the next X number of years as there are simply not enough people in the UK who agree with them in their current guise.