The Relevant bits are:
Article 103
In the case of an aerodrome (other than a Government aerodrome) in respect of which there is equipment for providing aid for holding, aid for let-down or aid for an approach to landing by radio or radar, the person in charge of the aerodrome shall:
(a) inform the CAA in advance of the periods during and times at which any such equipment is to be in operation for the purpose of providing such aid as is specified by the said person; and
(b) during any period and at such times as are notified, cause an approach control service to be provided.
And
Rule 40
(1) Subject to paragraph (2), the commander of an aircraft shall not make use of any radio navigation aid without complying with such restrictions and appropriate procedures as may be notified in relation to that aid unless authorised by an air traffic control unit.
(2) The commander of an aircraft shall not be required to comply with this rule if he is required to comply with rule 31.