The Authority has the power to issue Directions to centres under the Human Fertilisation and Embryology Act 1990. Directions are essentially rules.
Directions can be "General" which apply to all centres or "Special" which apply to particular licensed centres.
If a centre fails to comply with Directions this would amount to a breach of a statutory licence condition which might lead to the variation, suspension or revocation of a centre's licence.
General Directions are normally sent to clinics by the Chair of the Authority accompanied by a Chair's Letter that explains the reasoning behind issuing the Directions.