I reckon what with the other potential problems, and to ease my mind, a full replacement CU is going to be easier. The metalclad CU is equipped with old push button MCB's. Looking at the costs of a 45 amp RCBO (if one can be obtained for this model CU) and with a fully loaded 12 way split load for sale from screwfix at under £70 I think it may be time for an upgrade. Thanks for the advice though we'll err on the side of caution.
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