[holding answer 15 January 2008]: The proportions of new build completions in England that are houses and flats are tabled as follows. The information is presented as proportions not absolute numbers because dwelling type is collected centrally for only about half of the new build activity.
Houses Flats 2000-01 80 20 2001-02 77 23 2002-03 73 27 2003-04 66 34 2004-05 59 41 2005-06 54 46 2006-07 53 47 Source: National House Building Council
The information is published in the Housing Statistics Live Tables (table 254) on the Communities and Local Government website.