Not that I'm obsessed with Lenin - just making sure we keep a sensible eye out for relevant historical precedents.
The story so far: the Brexit vote convinced the semi-dormant UK Marxist-Leninist tendency that perhaps the Revolution was just around the corner. This is because Marx teaches that the Big R comes when the masses intuitively understand that things are so bad for the 99% that Any Change Whatsoever in the political disposition must be for the better. The referendum, they think, signalled just such a phenomenon. (We must of course skate lightly over the complete absence of a whole slew of other preconditions stipulated by Marx. But that's no problem: they've been doing that for 150 years now.)
By dint of the decay of the People's Party, and boosted by May's criminally crass GE campaign of 2017, it happens that a bunch of actual Marxists rule the roost in Labour. Corbs himself is an idle bastard but there are several, McDonnell being the most prominent, who would seriously fancy their chances as Leninists, the energetic midwives of Revolution, Paul to Marx's Christ.
What signs are we looking for? Lenin was a tactician of genius, with Wellington's eye for an accurate assessment of a situation, both overall and as things developed dynamically. Fortune favours the prepared mind - most specifically, when that mind is allied to the ability to identify the moment, seize the moment and execute decisively.
Lenin prescribed "the strictest loyalty to the ideas of communism [plus] an ability to make all the necessary practical compromises - to tack, make agreements, zigzags, retreats, and so on". In the run-up to October 1917, he also insisted that the bolsheviks promise the masses everything they wanted - the big stuff: food, land, peace - however undeliverable. At that very moment (April 1917) the mensheviks and the 'social revolutionaries' (the peasant party) were involving themselves with the first post-Tsar government and were accordingly much more concerned about the practicalities and responsibilities of actually delivering. Their promises were modest. Come October and the bolsheviks swept all before them.
We don't need to stretch the facts too much to draw the parallels. In their first outing in the 2017 manifesto, the Corbynites tried a Big Promise - tuition fees - with evident success; and even bigger ones are presumably in the pipeline, doubtless including the fatuous "zero carbon by 2025". No shortage of tacking and zigzagging either, with the government on a piece of string over the "Brexit deal negotiations". (And what are the Tories doing? Publishing Damian Green's earnest report on financing old-age care with an "old age tax"!)
If this thesis is correct we can expect some truly boggling broad-brush promises in Labour's euro-manifesto, plus of course what everyone has long predicted for the "negotiations" - i.e. complete bad faith. There might also be some 'agreements' with various of the other greenish-reddish players, but only of the most limited, short-lived, expedient kind. I'd also guess, though, that the real Leninists (Milne et al) will continue to fortify Corbyn's refusal to back R2, whether or not this does them any good in other respects.
That's the great thing about Leninists. Once they lock in on whatever they consider really important, they are unwavering. For all the zig and zag on the periperals and the trivia, there will be some things on which they won't be moved. They love a good piece of devious treachery; but they also love a good bit of utter intransigence. "Strictest loyalty." For good or ill. Can be a strength: but not always ...