A vehicle comprising: A decorative trim element; a bumper cover (4,5); and one or more couplings, wherein each coupling releasably couples the bumper cover (4,5) to the trim element so as to align the bumper cover (4,5) to the trim element and each coupling is arranged to release the bumper cover (4,5) from the trim element when the bumper cover (4,5) receives an impact force above a predetermined level; the or each coupling comprising a body, and the body comprising: a hole for receiving a bumper cover attachment means to attach the coupling to the bumper cover (4,5) or a part connected to the bumper cover (4,5); and a mouth having an opening to engage with part of the trim element and comprising a first surface and an opposing second surface, a recess formed in the second surface, and a resilient tooth for engaging with the trim element, wherein the tooth is attached at one end to the coupling and has a free end which can flex and bend into the recess; wherein the tooth comprises a shaped surface for contacting a part of the trim element; the shaped surface comprises a first engagement portion and a second engagement portion; the first and second engagement portions (19,25) are curved; and the curve of the second engagement portion is steeper than the curve of the first engagement portion. A decorative trim element; a bumper cover (4,5); and one or more couplings, wherein each coupling releasably couples the bumper cover (4,5) to the trim element so as to align the bumper cover (4,5) to the trim element and each coupling is arranged to release the bumper cover (4,5) from the trim element when the bumper cover (4,5) receives an impact force above a predetermined level; the or each coupling comprising a body, and the body comprising: a hole for receiving a bumper cover attachment means to attach the coupling to the bumper cover (4,5) or a part connected to the bumper cover (4,5); and a mouth having an opening to engage with part of the trim element and comprising a first surface and an opposing second surface, a recess formed in the second surface, and a resilient tooth for engaging with the trim element, wherein the tooth is attached at one end to the coupling and has a free end which can flex and bend into the recess; wherein the tooth comprises a shaped surface for contacting a part of the trim element; the shaped surface comprises a first engagement portion and a second engagement portion; the first and second engagement portions (19,25) are curved; and the curve of the second engagement portion is steeper than the curve of the first engagement portion. a hole for receiving a bumper cover attachment means to attach the coupling to the bumper cover (4,5) or a part connected to the bumper cover (4,5); and a mouth having an opening to engage with part of the trim element and comprising a first surface and an opposing second surface, a recess formed in the second surface, and a resilient tooth for engaging with the trim element, wherein the tooth is attached at one end to the coupling and has a free end which can flex and bend into the recess; wherein the tooth comprises a shaped surface for contacting a part of the trim element; the shaped surface comprises a first engagement portion and a second engagement portion; the first and second engagement portions (19,25) are curved; and the curve of the second engagement portion is steeper than the curve of the first engagement portion.