It really depends on what you mean by "left wing".
I always find it a little strange when people assume an "anti-benefit" stance is right-wing, because it was a common and encouraged attitude towards non-workers who survived on state funds in both Soviet Russia and "socialist" Poland.
Indeed, in every communist or socialist state I've looked at, state ideology enforced work as a fundamental social and political behaviour. Even if the work was meaningless or pointless, or involved doing bugger all, you still had to turn up. Otherwise, you were an enemy of the people and the socialist/communist system.
I mean, come on, Marxist thought pivots around the figure of the worker and the concept of labour creating value. You can't be a Marxist and accept the notion that able-bodied adults should be able to live off the labour of others; that's kind of the point of the original critique of capitalism.
What I see a lot of on mn is a kind of modern liberal code of equality and "niceness" that is a mix of enlightened 19th century philanthropic attitudes (that owe a fair bit to the filtering down of noblesse oblige as a class signal), mixed with a bit of old Methodism, and filtered through the demands of a 20th century post-industrial social democracy. It's a kind of mutant child of lots of bits of stuff, and fundamentally evolved because the approach is one of the only ways to perceive modern British society without advocating for too much upheaval.