Hi I would think the supply for conservatory comes from house ring circuit via an unswitched fused spur next to an existing socket nearby, it will look like a blank plate but has a 13A fuse holder in flush with front plate,
this can then run to sockets in cons. plus via another fused spur which fuses down to 5A for the lights, have a look at most likely place you would take the supply from if fitting the cons. yourself, happy hunting,
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