Application forms for the Back to School Clothing and Footwear Scheme should be available at the local health centre, even if you can't contact the CWO directly.
You'll also be able to check if there's a specific CWO clinic for return of the forms (some CWOs run clinics separate from their regular clinics for the scheme).
If you can't get through to the CWO and can't get to the health centre, contact the office of the Superintendent CWO who may be able to send you a form in the post.
The scheme runs until 30th September, so there's plenty of time to apply.