For my old house, the exchange went live in November 2010, and all the cabinets in my surrounding area were live and orderable in December 2010.
My cabinet was physically installed at the same time as the others (October 2010), but didn't go live at the same time. It eventually went live at the end of March 2011, and took until June for my order to be installed; from the various roadworks that happened, it looks like they had problems finding power for it.
It is certainly frustrating when you are on the receiving end, but it is also perfectly understandable - there will be some percentage of cabinets where problems are encountered, and the cheapest way to deal with them in the rollout is to put them to one side, and sort things out later.
At the time, Openreach had no method to find out what was going on, so you just had to employ patience. It is a useful commodity, sometimes.