A method for forming an overmoulded assembly, the method comprising: conforming a planar body of fibre reinforced material to a shape of a shape defining member, the material comprising continuous fibres in a synthetic matrix and the shape defining member defining an internal volume of a closed cross-section portion of a vehicle reinforcing member (200, 300, 402); bonding a first edge portion of the body of fibre reinforced material to a second edge portion of the body of fibre reinforced material thereby to form, around the shape defining member, the closed cross-section portion of the vehicle reinforcing member (300,402); and overmoulding a shell onto the vehicle reinforcing member and a further vehicle reinforcing member to integrally connected the shell and body of fibre reinforced material, while keeping the shape defining member in the closed-cross-section portion with the proviso that conforming the planar body of fibre reinforced material comprises contacting a first mould member, which first mould member comprises a concave section shaped to cooperate with the shape of the shape defining member, and wherein bringing the first mould member and shape defining member together comprises positioning the planar body of fibre reinforced material between the concave section and shape defining member, with the planar body of fibre reinforced material and bringing the first mould member and shape defining member together, with the planar body of fibre reinforced material therebetween, to at least partially conform the planar body of fibre reinforced material to a shape of the shape defining member and positioning the body of fibre reinforced material such that the first and second edge portions protrude outside of the concave section characterized in that bonding the first edge portion to the second edge portion comprises contacting the body of fibre reinforced material with a second mould member and third mould member respectively to bring one of the first edge portion and second edge portion against the shape defining member, the first and second edge portion overlapping each other and the third mould member is heated to a bonding temperature of the fiber reinforced material. conforming a planar body of fibre reinforced material to a shape of a shape defining member, the material comprising continuous fibres in a synthetic matrix and the shape defining member defining an internal volume of a closed cross-section portion of a vehicle reinforcing member (200, 300, 402); bonding a first edge portion of the body of fibre reinforced material to a second edge portion of the body of fibre reinforced material thereby to form, around the shape defining member, the closed cross-section portion of the vehicle reinforcing member (300,402); and overmoulding a shell onto the vehicle reinforcing member and a further vehicle reinforcing member to integrally connected the shell and body of fibre reinforced material, while keeping the shape defining member in the closed-cross-section portion with the proviso that which first mould member comprises a concave section shaped to cooperate with the shape of the shape defining member, and wherein bringing the first mould member and shape defining member together comprises positioning the planar body of fibre reinforced material between the concave section and shape defining member, with the planar body of fibre reinforced material and bringing the first mould member and shape defining member together, with the planar body of fibre reinforced material therebetween, to at least partially conform the planar body of fibre reinforced material to a shape of the shape defining member and positioning the body of fibre reinforced material such that the first and second edge portions protrude outside of the concave section characterized in that bonding the first edge portion to the second edge portion comprises contacting the body of fibre reinforced material with a second mould member and third mould member respectively to bring one of the first edge portion and second edge portion against the shape defining member, the first and second edge portion overlapping each other and the third mould member is heated to a bonding temperature of the fiber reinforced material.