A sacrificial hinge for a seat for a vehicle wherein (a) the seat comprises a seat portion and a backrest portion; and (b) the sacrificial hinge comprises: (i) first securing means for securing to the seat portion; (ii) second securing means for securing to the backrest portion; (iii) pivot means for enabling the first securing means to pivot with respect to the second securing means; (iv) deformable means which is configured for deforming consequent upon the vehicle receiving a blast from a mine, with the deformation enabling the first securing means to move with respect to the second securing means; and (v) control means for controlling the movement of the first securing means with respect to the second securing means; and(c) the sacrificial hinge being configured such that (vi) the first securing means pivots with respect to the second securing means about the pivot means in order to allow in use the seat portion to pivot between a horizontal use position and a vertical non-use position; (vii) the deformable means deforms as a result of forces applied to the sacrificial hinge; (viii) the deformation of the deformable means enables the seat portion to move downwardly with respect to the backrest portion; (ix) the downwards movement of the seat portion with respect to the backrest portion is controlled by the control means; characterised in that the deformable means is an apertured lattice member; and the deformable means are located in a housing. (a) the seat comprises a seat portion and a backrest portion; and (b) the sacrificial hinge comprises: (i) first securing means for securing to the seat portion; (ii) second securing means for securing to the backrest portion; (iii) pivot means for enabling the first securing means to pivot with respect to the second securing means; (iv) deformable means which is configured for deforming consequent upon the vehicle receiving a blast from a mine, with the deformation enabling the first securing means to move with respect to the second securing means; and (v) control means for controlling the movement of the first securing means with respect to the second securing means; and(c) the sacrificial hinge being configured such that (vi) the first securing means pivots with respect to the second securing means about the pivot means in order to allow in use the seat portion to pivot between a horizontal use position and a vertical non-use position; (vii) the deformable means deforms as a result of forces applied to the sacrificial hinge; (viii) the deformation of the deformable means enables the seat portion to move downwardly with respect to the backrest portion; (ix) the downwards movement of the seat portion with respect to the backrest portion is controlled by the control means; characterised in that the deformable means is an apertured lattice member; and the deformable means are located in a housing. (i) first securing means for securing to the seat portion; (ii) second securing means for securing to the backrest portion; (iii) pivot means for enabling the first securing means to pivot with respect to the second securing means; (iv) deformable means which is configured for deforming consequent upon the vehicle receiving a blast from a mine, with the deformation enabling the first securing means to move with respect to the second securing means; and (v) control means for controlling the movement of the first securing means with respect to the second securing means; and(c) the sacrificial hinge being configured such that (vi) the first securing means pivots with respect to the second securing means about the pivot means in order to allow in use the seat portion to pivot between a horizontal use position and a vertical non-use position; (vii) the deformable means deforms as a result of forces applied to the sacrificial hinge; (viii) the deformation of the deformable means enables the seat portion to move downwardly with respect to the backrest portion; (ix) the downwards movement of the seat portion with respect to the backrest portion is controlled by the control means; characterised in that the deformable means is an apertured lattice member; and the deformable means are located in a housing.