CAMBRIDGE INDUSTRIAL ESTATE, SALFORD, 5.58AM Yesterday morning, I left my studio at 5.30am, and made my way up to the Cambridge industrial estate, which lies just beyond the banks of the River Irwell in Broughton. Above me was a glum sky, which only grudgingly allowed smears of cleaner blue through just before sunrise. The birds were up early, forcefully calling their information songs out to each other through the rough branches of trees, left to hang wild over derelict land […]