Crest Nicholson has announced a 22% increase in housing completions as takeover speculation continues to dog the housebuilder. In a trading statement Crest revealed that completions had risen from 2,417 to 2,946 in 2005. Its affordable housing output doubled to 911 resulting in a drop in its average selling price from £225,000 to just under £200,000 this year. Chief executive …