It is simple ... the person who wants the work done is responsible for the electrical installation ... no original COC ... no COC is issued for additions "pending original COC" ... if they dont produce an original you dont issue supplementary COC ... eventually if the property is ever sold a COC will be issued for the entire property including the plug you fitted
Think about ... at the price of twin +e ... its cheaper to get a COC than it is to get a socket outlet installed.
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