Since 2010 the Conservatives have borrowed £870 billion.
Since 1945 all Labour Governments combined borrowing is £490 billion.
The £600 billion figure is based on the assumption that the Labour Party introduces universal basic income for all adults. But the Labour Party has only said they will hold a trial into such a scheme. They have not promised to introduce it universally, or what amount the income figure will be per person (in other words, the assumption and costing is baloney).