Barratt\'s average selling price (ASP) has fallen by 3.7%, according to its latest trading update for the year ended June 30 2006. It expects to increase completions by 1.8% to 14,601, with an ASP of £165,000 – down on 2005 \"as a result of an increased proportion of social housing.\" The plc\'s social housing completions have grown by 53.5% to …