We may be used to N, E, S and W, but until the advent of the Northern Line (N to S) and Central Line (E-W) (and now Crossrail, also E-W), most trips were diagonal, so a hexagonal tesselation makes good sense.

The idea of colour-co-ordinating lamp-posts and presumably other street furniture plus bus destination blinds is a stroke of genius. It presages colour-coding of London’s Underground (and later, to a lesser extent, mainline) railways.

In the long term he’d have run out of colours and I suspect the whole thing might have become hopelessly unwieldy, but full marks for trying. Far too logical, though, for ‘muddle through and hope for the best’ Brits! We’re stuck with people wandering heads-down, zombie-like, trying to find their way along pavements with satnav and drivers blundering up one-way alleys.