This article is not available online as a post print* final peer reviewed draft until October 2008. You may contact the author for a personal copy to be sent to you: Christine.Craik@brunel.ac.uk Publisher: Oxford Univeristy Press Post-print: subject to Restrictions below, author can archive post-print (ie final draft post-refereeing) Restrictions: 12 month embargo * Definition of a post-print: A post-print is the final draft author manuscript, as accepted for publication, including modifications based on referees' suggestions but before it has undergone copyediting and proof correction.