Just found this on the ELECSA site regarding registration for approved persons. I hadn't realized either that even with such a certified person carrying out works the requirement to report to the council is still there, just handled by ELECSA.

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The cost structure for ELECSA is as follows:

Initial payment – Upon application, we will need you to supply us with payment for both 1 year’s registration and the one-day assessment. The registration fee is £100.00 plus VAT (£117.50) and the assessment charge is £400.00 plus VAT (£470.00). Therefore, the initial fee is £587.50.

Ongoing payments – Once you are fully registered with ELECSA, you will be charged for each installation that you register with us for the purposes of certification. Each of these will be charged at £1.50 plus VAT. In addition, after 12 months of registration, you will have to actively renew your registration. This will involve full reassessment and will a registration payment equal to the initial payment of £587.50.
£500 per year???!!! [Linked Image] (After reclaiming VAT). They gotta be kidding!