Taylor Wimpey has released an upbeat trading statement, despite a drop in home completions for the year. The housebuilder completed 20,645 homes on a pro forma basis in 2007, against 21,910 for the previous year. Its North American pro forma home completions in 2007 were 6,740, compared to 8,839 in 2006. But Taylor Wimpey stated that despite a challenging second …