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Power comes in via a 3 pin plug like you see on a camper van, which came pre-fitted to the back wall of the office. I poked around this to see if there was a neat way to run a cat6 cable in through this and there isn't.
With the benefit of hindsight, I should have gotten the contractor to set some pvc conduit into the base when he was laying it back in October. I could probably chase something into it now, but worried penetrating the damp proof course might allow some damp to seep in through the base, so will probably avoid that.
Where does the power come in?
Rather than drill through the side (inviting leaks & warranty problems), can you drill a hole / chase a channel in the base?