Information about the location of placements of looked after children and whether they are placed inside or outside of their local authority area can be found on the DCSF statistics website at the following link:
http://www.dcsf.gov.uk/rsgateway/DB/SFR/s000810/index.shtml
The required information is set out in Tables LAA18 and LAA19. These are in EXCEL format in the third set of additional tables on the above website.