https://www.slab.org.uk/guidance/second-solicitor-giving-advice-and-assistance-on-the-same-matter-prior-authority-required/
Your client cannot be given advice and assistance on the same matter by more than one solicitor without our prior authority. The online advice and assistance application for authority must:
Your client is not usually entitled to more than one grant of advice and assistance for a diagnostic interview from you or any other solicitor within any three month period following the approval for earlier diagnostic advice.
If your client seeks a second or further diagnostic interview within a three-month period, you must get our authority. We will only give this in exceptional circumstances and if you give us good reasons. If we refuse authority, you can ask us online to review this decision.
If we have agreed to substitute standard advice and assistance for the diagnostic interview, it becomes standard advice and assistance from its commencement.
No work is chargeable until we grant this authority.
Advice and Assistance application procedures
This page includes information on how to apply for non-templated increases in expenditure under civil A&A. It covers the information you should provide us with; case-related factors to address in your application; the process for reconsideration of refused increases; the process for urgently needed increases; whether authority for retrospective increases is available; and other guidance you may wish to consider.