Can public sector broadcasting, financed by compulsory statutory charges of the amount set by the law, on the basis of ownership of a radio receiver, possession thereof or entitlement to use it on other legal grounds, be regarded as the ‘provision of a service against payment' within the meaning of Article 2(1) of the Sixth Council Directive 77/388/EEC, which must be exempted from VAT in accordance with Article 13A(1)(q) of that directive, or is it a non-economic activity which is not subject to VAT at all under Article 2 of the Sixth Directive, and to which exemption from VAT in accordance with Article 13A(1)(q) of that directive does not therefore apply?