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Thanks to all for responses. Answers to a few questions: What material? the holes are cut through a double thickness of plaster board into a pipe duct. The duct is vertical and is between the garage and the kitchen (also connects to the roof, hence become a sort of mouse M25). The double...

My first time on this forum but have been lurking in the background for some time. A simple query to start I hope: during the rewire of a new kitchen last year, the electricians made some access holes from the integral garage into a pipe duct. They have fairly substantial bundles of cables...