I have a kitchen that's partly installed and realised that electrics for extractor not accounted for. I have a double socket with two flat grey wires going into them at ground level that would be behind oven if i left it like this but am wary of accesing these if anything goes wrong in the future. Am i able to wire from these sockets to feed oven, hob and extractor. I want easy access to all appliances and for oven and hob to plug into hidden sockets and extractor via an FCU (not an expert in any way shape or form) so that no cables are dangling around. Hope you can help