A person who provides a Tier 1 service must give OFCOM a notification (a "Tier 1 notification") to that effect.
Subsection (3) applies where—
OFCOM must, for the purpose of assisting with compliance with subsection (1), inform the provider of that Tier 1 service of that fact.
A person who gives a Tier 1 notification must also notify OFCOM if the person ceases to provide a Tier 1 service.
A Tier 1 notification or a notification under subsection (4) must—