Corbyn was widely categorised as hard left or extreme left. But I'd suggest that his policies were pretty much in line with Atlee, whom I've never heard described that way. Johnson, Patel, Rees Mogg etc are clearly considerably more right-wing than say Heath, but when we describe them as hard right we are told that is not correct. Anyone who believes these terms have any absolute meaning is, I'd suggest, somewhat blinkered. When I use them, I am honest enough to say it is for rhetorical effect, not because I think they have absolute meaning.