 A difference between baseline and intervention phase concerns the format of the parent AST report form, which may now be completed in writing as before, or by SMS text messages on the weeks the child is not wearing the accelerometer. Preference for either of the options can be stated in advance in the consent form. Parents will be asked to keep them, fill in and return on time every week personally or via the child, as the programme proceeds. Mobile phone respondents will be notified daily by SMS, to which they can reply directly. Questions asked will be the same in the paper version and mobile phone. However, on the two weeks the child wears the accelerometer, all participants will be asked to use the parent AST report. When the child is not wearing the accelerometer, the only question asked on the parental form or text messages is whether the child walkedcycled to school all or part of the journey. For those wearing the accelerometer in the intervention school, the point will be credited as long as the first question is answered i.e. if parent indicated whether child actively traveled but failed to complete questions on times. 