The invention disclosed is a tamper detection element to locate against a first member to detect tampering. The element has a resilient deformable member able to deform because of tamper induced deformation, a contact sensing member disposed towards the resilient deformable member, a first electrically conductive portion adjacent or on the resilient deformable member, and a second electrically conductive portion on the contact sensing member. An electrical relationship can then be formed between the first and second electrically conductive portions, and the tamper induced deformation results in a change of impedance of the electrical relationship, the change therefore indicative of the tampering.