It would be understandable if former London Docklands Development Corporation boss Eric Sorensen was a bit gloomy.He was front-runner to head the GLA but that job went to a Livingstone crony. Judging by current appearances, however, he is enjoying his new role as development director for the St Mary's Hospital site in Paddington, being masterplanned by SOM, cracking the whip and tightening everything up. He found time last week to launch formally the latest phase in the development of the Trinity Buoy Wharf arts enclave in Tower Hamlets, the site having been donated to the borough by the corporation.He warmly welcomed the stacked-container development designed by Nicholas Lacey as lowrent artists' studios (AJ 8.2.01). It turns out that Lacey did his AA thesis on the reuse of containers back in the '60s. Some ideas have a long gestation.