Part 4: On-demand programme services Section 368AB Overview of Part 4A
368AB provides an overview of the new structure of Part 4A of the CA 2003. Chapter 1 is definitional, Chapter 2 is the regulation of on-demand programme services, Chapter 3 is the regulation of ‘Tier 1’ services (as to which, see further at section 368HA below), Chapter 4 is enforcement, Chapter 5 is supplementary.
	Subsection (4) updates the definition of ‘the appropriate regulatory authority’ in the CA 2003 to clarify that OFCOM are the appropriate regulatory authority for ensuring compliance with new Tier 1 standards, (as to which see section 368HF below). It also updates the language of this section on the appropriate regulatory authority to include non-UK on-demand programme services, as defined above.
	Subsection (5) inserts a new chapter heading to section 368B of the CA 2003: "Chapter 2: Regulation of on-demand programme services".
	Sections (6) to (8) explain Schedules 5, 6 and 7, described below, which contain amendments to Part 4A of the CA 2003 and other legislation.
	The ‘Tier 1 services’, to which the title of this section references, comprise a new sub-category of on-demand programme services and non-UK on-demand programme services specified in regulations. Tier 1 services will be subject to enhanced regulation. This will include some non-UK services, which were previously not under the regulation of Part 4A of the CA 2003. These services are now brought within scope of Part 4A of the CA 2003 on on-demand programme services, and the enhanced regime being introduced for Tier 1 services. The definition of Tier 1 services, and the detail of the regulation applicable to them is set out in Schedule 5.