I'm a building expert and here's how I choose between private building control and Local Authority Building Control
Briefly

The Local Authority Building Control (LABC) remains a traditional and familiar route for compliance, offering reliable processes and local officers with site-specific knowledge.
Registered Building Control Approvers (RBCA) can provide a more convenient and potentially affordable alternative to LABC, focusing on efficiency and tailored service for self builders.
Read at Homebuilding & Renovating
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