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After discussions with the part P sparky, I replaced the complete CU. TLC had a good offer going with a 12 way CU, c/w 9 MCB's for £73... I also had to upgrade my incomer tails and all bonding to current regs!!

Doh!....I've sent you down the wrong path alittle. I was going to extend the new ring to the existing ring, as per jondiy comments. And use the spare 15A MCB for the lighting circuit. But I do like the idea of using the spare 15A MCB as a feeder to another FCU. I assume it would be okay...

Thanks jondiy. Regarding the Building Control, the officer had made several building checks, and explained that he would require test certificates for the electrics. No mention of a Part P electrician to perform the work, but we did explained that I was once a JIB Approved...

I've had an extension built and have installed a ring main and lighting circuit within. I have brought the circuit tails back to the existing CU, but have since been informed that the CU MCB's are now obsolete. I now plan to add another 2 way CU alongside rather than replace the complete CU...