https://www.slab.org.uk/guidance/applying-for-sanction-for-counsel-2/
You must apply for approval online and provide all the information requested. In a case of exceptional urgency and where you do not have immediate access to appropriate facilities for an online application you may apply by telephone. You should then promptly send us the online application, if we grant or part grant your application over the telephone.
Once you have identified the need for counsel, you should apply to us for approval to employ counsel as soon as possible. The request should:
In the application itself you must:
Procedures after legal aid is granted
Find out what documents/information should be provided when applying for approval for unusual expenditure or work likely to involve unusually large expenditure.
Procedures after legal aid is granted
Learn about what information Reporters will disclose in proof proceedings, when sanction is needed before taking precognitions and joint or shared precognitions