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Thanks Tonyav, it seems quite an ambiguous topic. Obviously asbestos CAN be dangerous, but I have no idea when the ceiling was artexed. Some say the levels in artex are very low and pose very little risk, others say dont risk it. I am only knocking off the high points, but still wouldnt want to risk my health for the sake of a smooth ceiling. I have put down lighters in my kitchen, which I believe has artex under the smooth surface, so have probably been exposed to any potential risk by drilling the holes for them.