Here is the law: http://www.legislation.gov.uk/ukpga/2006/36/section/8 http://www.legislation.gov.uk/ukpga/2006/36/section/8 It refers to "telegraph station" a

Here is the law: http://www.legislation.gov.uk/ukpga/2006/36/section/8 http://www.legislation.gov.uk/ukpga/2006/36/section/8 It refers to "telegraph station" and "apparatus". A Faraday cage is not a telegraph station, so it must be an apparatus to be covered under that law. What does that mean? I think it's defined in http://www.legislation.gov.uk/uksi/2016/426/regulation/3/made http://www.legislation.gov.uk/uksi/2016/426/regulation/3/mad... : > “apparatus” means any finished appliance or combination of appliances, liable to generate electromagnetic disturbance, or the performance of which is liable to be affected by such disturbance, and which generates, or is designed to generate, or is liable to generate fortuitously, electromagnetic energy at frequencies not exceeding 3,000 gigahertz and includes— > (a) components or sub-assemblies intended for incorporation into an apparatus by an end-user, which are liable to generate electromagnetic disturbance, or the performance of which is liable to be affected by such disturbance; > (b) mobile installations defined as a combination of apparatus and, where applicable, other devices, intended to be moved and operated in a range of locations; Are you arguing that a Faraday cage is a "finished appliance or combination of appliances"? And it "generates, or is designed to generate, or is liable to generate fortuitously, electromagnetic energy"? If not, then it is not an apparatus, and so not regulated under the law you pointed to. If you still think it is illegal, then please cite the actual law, and not some commentary about the law, as commentaries are more open to misinterpretation.