The organised walk is linked to the entirely wonderful sound map that Alan and The Guardian's Francesca Panetta have recently posted on The Guardian's site: http://www.guardian.co.uk/society/interactive/2010/apr/26/caledonian-road-sound-map
It's a fantastic piece of audio - strong voices, specially commissioned music and magical production. (And the images and web design are also impressive). Alan took along a ghetto blaster so we could hear some local voices and stories as we walked.
We started close to what was once the Caledonian market (the clock tower and the railings are almost all that survives) - a live meat market from the mid-nineteenth century which turned in to London's largest flea market but came to an end with the Second World War. On through the Caldeonian Estate to Pentonville jail - there's a road just to the north side, a public throughfare leading to blocks of warders' housing, which doesn't appear in the A-to-Z, I suppose in a nod towards security.
Then under the Ferodo bridge (I didn't know that Ferodo had a deal once with a big building concern to feature on all their bridges) into the Cally Road proper. It's a haven of family-run shops and small businesses. Hardly any chains. Prosperous Barnsbury to the east - slightly run down social housing to the west. Towards the canal, we walk past a recycling bin for kinives - an attempt to tackle gang-related street crime.
Then on towards what used to be the Geberal Picton - a local turned gastropub, The Drivers, with a vertical garden on its exterior walls. A sign of the gentrification that is increasingly evident at the southern extremity of the road. I just hope Housman's bookshop survives.