Economist is socially liberal and pro buisness. Labour more or less fits them as being moderately socially liberal, and the conservatives have turned somewhat extreme and unpredictable on the economic front, namely with Brexit, the economist very much supports free trade and thinks labour can do a better job at it.
For people like me who are actually leftist, this means even though labour’s gonna win by a landslide, I shouldn’t prepare to expect changes too big.