The headquarters of the Independent Workers Union of Great Britain (IWGB) is a basement room beneath a dry cleaner’s in Central London.

From a loading bay behind a row of shops, concrete steps lead down to a flimsy door, with a pile of leaflets beside it and ‘IWGB office’ scribbled above it on a piece of A4.

Behind the door is a whitewashed space with metal shelves, neatly stacked with placards and furled banners, and four desks…..

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