An enclosure (10) for optical fibre cable or patch cord connections comprising a casing (20), an optical connection adaptor (80), a holder (90) for the connection adaptor, and cable or cord strain relief means attachable to the casing, wherein the holder is integral with or secured or securable within the casing and allows limited axial movement of the adaptor inside the holder over an axial distance (α) greater than the distance of flexural distortion of the casing which is caused at the point of strain relief attachment by manual traction on the cable or cord outside the casing.