The London Review of Books published an interesting article by Lora Finlayson which is available on their website at https://www.lrb.co.uk/v40/n18/lorna-finlayson/corbyn-now. For example she writes “The disagreement about Labour’s true identity has more to do with clashing ideals in the present than with conflicting analyses of party history – but the history is often bent to fit a particular agenda. It is a distortion to present Corbynism, as its critics sometimes do, as the second wave of an alien invasion: first the Militant Tendency, now Momentum. Corbyn’s politics belong to a tradition that stretches back to Labour’s beginnings (this could never be said of Tony Blair’s).”
and “… according to the economist James Meadway, the economic proposals in Labour’s 2017 manifesto were more conservative than those put forward in 1983 by the SDP…”
The article is well worth a read.