exposed on the outer surface of the enclosure 26 a thin layer of adhesive blackened with a light loading of carbon is applied to the enclosure 26 and conceals the lines the enclosure 26 is located within a mould which is then filled with cold pour polyurethane the polyurethane is then cured and hardened to form the outer enclosure 28 the resulting moulding is opaque and preferably has a thickness of around 2 5 mm in this example the outer enclosure 28 completely encapsulates the inner enclosure 26 providing a complete environmental seal and thus protecting the interior of the enclosure from damp dust and the like during the moulding operation the uncured liquid polyurethane flows into any gaps or spaces that may have been left after folding the laminate 32 further the hardened polyurethane is resilient having a shore hardness of 70 and thus provides an enclosure which is robust in normal use the outer enclosure 28 provides added security for the enclosure in a number of ways as will be described below the normal variances in the thickness of the enclosure 28 result in the position of the inner enclosure within the moulding varying slightly for each enclosure produced accordingly even after examination of a similar enclosure it is not possible to determine with any accuracy the location of an inner enclosure 26 relative to the moulding 28 in another enclosure also as the liquid polyurethane will have flowed into any gaps or voids in the inner enclosure 26 the possibility of potential weak spots arising is minimised the outer moulding 28 adheres firmly to the inner enclosure 26 and by appropriate selection of materials is chemically bonded to the enclosure 26 after curing further in the.