Labour actually has no policy vacuum. Instead, the Conservatives keep stealing its polices, though the Tories do not follow through all the time.
First of all, is the Windfall tax. Though to be fair, Labour have called upon the government to introduce this. The government have improved what Labour wanted to offer, but if Labour had appeared to be too generous on this, they would have been accused of spending too much.
This has happened in the past. May stole Labour polices on energy prices despite this being rubbished when Ed Miliband proposed it. There was the National Living Wage, brought in after Labour had called for an increase in the minimum wage. Miliband wanted action on Junk food, the Conservatives stole it with the Sugar Tax. Addressing letting agent fees was another Labour policy, again stolen. In 2015, Labour wanted companies to publish figures on the Gender Pay Gap, stolen by the Tories.
And there was the promise by Labour in 2015 for 8000 more GP's and 20,000 more nurses for the NHS. The Conservatives promised 5,000 more GP's and failed to deliver on that!
So when someone asks what are the policies of Labour, please remember that when they have stated what they are, the Conservatives steal them.