Retaining apparatus comprising: (i) first and second retaining elements (4, 6) extending adjacent one another; (ii) a hinge connecting the first and second retaining elements (4, 6) at a hinge zone; and (iii) detent means which is at an end of the second retaining element farthest from the hinge and which is arranged to hold together the first and second retaining elements (4,6); the retaining apparatus being such that: (iv) the first retaining element has an ability to be reorientable with respect to the second retaining element between a first position of stability which is convex in an open position of the retaining apparatus and a second position of stability which is concave in a closed condition of the retaining apparatus; (v) the first retaining element comprises a first part and a second part; (vi) one of the first and second parts (14, 16) is shorter than the other of the first and second parts (14,16) in order that the first retaining element has the ability to be reorientable; and (vii) the first and second retaining elements (4, 6) and the hinge are all formed from the same sheet of material; (viii) the detent means comprises a curved end of the second retaining element; and (ix) in the second position of stability, the end of the first retaining element farthest from the hinge is under the detent means;and characterised in that (x) the shorter one of the first and second parts (14,16) is crimped such that the crimping causes the shortening; (xi) the first and second retaining elements (4,6) and the hinge are formed as a one piece unit which does not have additional parts holding the first and second retaining elements (4,6) in their relative positions. (i) first and second retaining elements (4, 6) extending adjacent one another; (ii) a hinge connecting the first and second retaining elements (4, 6) at a hinge zone; and (iii) detent means which is at an end of the second retaining element farthest from the hinge and which is arranged to hold together the first and second retaining elements (4,6); the retaining apparatus being such that: (iv) the first retaining element has an ability to be reorientable with respect to the second retaining element between a first position of stability which is convex in an open position of the retaining apparatus and a second position of stability which is concave in a closed condition of the retaining apparatus; (v) the first retaining element comprises a first part and a second part; (vi) one of the first and second parts (14, 16) is shorter than the other of the first and second parts (14,16) in order that the first retaining element has the ability to be reorientable; and (vii) the first and second retaining elements (4, 6) and the hinge are all formed from the same sheet of material; (viii) the detent means comprises a curved end of the second retaining element; and (ix) in the second position of stability, the end of the first retaining element farthest from the hinge is under the detent means;and characterised in that (x) the shorter one of the first and second parts (14,16) is crimped such that the crimping causes the shortening; (xi) the first and second retaining elements (4,6) and the hinge are formed as a one piece unit which does not have additional parts holding the first and second retaining elements (4,6) in their relative positions.