I guess it's an attempt to cross the Sopranos with BBC costume drama. It doesn't quite gell. The writers haven't decided whether their "hero" is a social-climbing fantasist, pathetically out of touch with the realities of swinging London (it's the era of the Beatles and the Stones and he's a Garland fan for pity's sake) or an archetypal lone wolf/gunslinger/samurai. Period colour is laid on lavishly but background is skimped. The Kray's were strong because they were family, but this guy has no-one but his dear old Jewish mother; where then is his power base?
Print the legend? But I already know the legend. I'd rather be told how the system works.