Maybe Rebecca Long Bailey or Ian Lavery. They would have to be a Democratic Socialist and not a Social Democrat, I don't want anyone with liberal ideals, traditional Labour always had a small C conservative approach, it is patriotic, it is strong on defence, it is strong on police, it cares first and foremost about the working class (should be everyone), it refutes neo-liberal economics (well it shouldn't), regulates the markets (within reason), brings vital industry and infrastructure under state control (should only be with commercially viable reason), it pursues the mantra of from each according to their ability, from each according to their needs, it attempts to create equality of opportunity not equality of outcome (the left has dismantled and thorougly rejected this notion in favour of "diversity" and "equality", and no left Labour leader is going to reject that ideology, not even Starmer does), it respects traditional family values (the left as it standsdoesn't, it fundamentally rejects the traditional family unit and values in favour of blaming successful and white people for societal failures in under-developed communities instead of owning their own failures), it never panders to racists (cough anti-semitism) or bigotry of any form (plenty of white and biological women blaming going on freely on the left these days). It makes sure everyone has a home, everyone has a job (communistic working practices don't work), if they cant work then they have a proper safety net (do they also have the obligation to take proper personal responsibility?), they look after the old properly with a real pension and proper social care (pensioners get the best deal out of anyone pre-Covid). They treat mental health as seriously as they treat physical health, they never privatise the NHS in any shape or form (private services have merit as long as the core principles and facilities of the NHS are upheld). Immigration is controlled but asylum seekers are made welcome (waits for the definition of asylum seeker to magically change to anyone who wants to come here instead of settle in the mainland Europe they've just managed to cross), we leave and stay out of the EU, we question the mission of NATO and we build a proper army, airforce and navy (20th century) and get rid of useless vanity nuclear weapons (political deterrent). The party is internationalist not isolationalist (but we leave the EU...). It is secular yet respects the rights to religion (does it respect the right not to be killed in this country by religion and tackle the communities who facilitate it?), it ends the vacuous system of hereditary and religious representation in parliament (cool). It is federalist and unionist (I like the Queen), it respects devolution and furthers it to the regions (it's either a union or devolved), it gives power back to local leaders and away from Whitehall. It gets rid of zero hours contracts (they are useful in certain respects), it taxes wealth properly (by properly you mean excessively) and income appropriatelty (appropriately: see properly) in a progressive (progressive: twinned with punitive) manner. It reduces the regressive VAT and puts an end to tax avoidance and closes tax havens (good luck). Corporations pay proper tax (bon chance) and sweetheart deals to corporations are made illegal (yeah...). Eventually introduce UBI (as if we don't have a gimme, gimme, gimme society enough as it is) and shorten the working week to 30 hours, invest in the arts, they are just as much for the working class as they are for the capitalist class (there's plenty more needs investing in first). Sport is made central to health and all sports clubs are funded properly and not allowed to be owned by cunts (subjective).
There is more but my tea is ready, that is a taster of the "far" left politics of Rascal. Make of it what you will.