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it's an extension from the back of the house of questionable workmanship.
the plug in the far left that has a cable running outside powers a double external socket and then the entire rear 8x4.5m summerhouse is ran off of that extension, lights, sockets the lot.
we have an electrician coming to do an eicr and then quote to replace the consumer unit, run proper power out to the summer house and check for every hidden bodge they can find.
Do. not. like.