To ask the Scottish Executive, further to the answer to question S2W-5869 by Malcolm Chisholm on 10 February 2004, whether the increase of #305,986 between 2002 and 2003 of the gross ingredient cost of methylphenidate hydrochloride was solely due to the introduction of Concerta XL; what the total cost of Concerta XL has been since its introduction, and how many prescriptions of Concerta XL have been issued.