A clamp assembly for securing a fuel cell stack arrangement in a compressed condition following compression thereof using a compressing means, wherein the fuel cell stack arrangement includes at least an electrode assembly interposed between an upper current collector and a lower current collector; the clamp assembly comprising: a first endplate and a second endplate configurable such that the fuel cell stack arrangement is supportable between the first endplate and the second endplate, and at least one substantially rigid clamping device (60, 70, 80, 90), the clamping device (60, 70, 80, 90) comprising: spaced apart elongate clamp members for engaging outer surfaces of the first and second endplates respectively along peripheral edges thereof, and support members, the elongate clamp members being interposed by the support members disposed substantially in a first direction and wherein the length of the support members is greater than the height of the fuel cell stack arrangement in a compressed condition thereof; wherein: the first and second endplates define docking formations in the form of step-like recesses (35a, 35b, 36a, 36b, 55a, 55b, 56a, 56b) locatable in inverted relation to one another along peripheral edges thereof for engaging the clamp members in a compressed condition of the fuel cell stack arrangement, the clamp members being disposed substantially in a second direction, said second direction being perpendicular to the first direction, the docking formations being configured to define spaces between the endplates (30, 50) and the compressing means, the clamp members being receivable within the spaces during compression of the fuel cell stack arrangement, and the clamp assembly is configured such that, in use, release of the compressing means causes the clamp members to become captively engaged within the docking formations against recoil pressure of the fuel cell stack arrangement such that the fuel cell stack arrangement is held captive in the compressed condition between the clamp members. a first endplate and a second endplate configurable such that the fuel cell stack arrangement is supportable between the first endplate and the second endplate, and at least one substantially rigid clamping device (60, 70, 80, 90), the clamping device (60, 70, 80, 90) comprising: spaced apart elongate clamp members for engaging outer surfaces of the first and second endplates respectively along peripheral edges thereof, and support members, the elongate clamp members being interposed by the support members disposed substantially in a first direction and wherein the length of the support members is greater than the height of the fuel cell stack arrangement in a compressed condition thereof; spaced apart elongate clamp members for engaging outer surfaces of the first and second endplates respectively along peripheral edges thereof, and support members, the elongate clamp members being interposed by the support members disposed substantially in a first direction and wherein the length of the support members is greater than the height of the fuel cell stack arrangement in a compressed condition thereof; the first and second endplates define docking formations in the form of step-like recesses (35a, 35b, 36a, 36b, 55a, 55b, 56a, 56b) locatable in inverted relation to one another along peripheral edges thereof for engaging the clamp members in a compressed condition of the fuel cell stack arrangement, the clamp members being disposed substantially in a second direction, said second direction being perpendicular to the first direction, the docking formations being configured to define spaces between the endplates (30, 50) and the compressing means, the clamp members being receivable within the spaces during compression of the fuel cell stack arrangement, and the clamp assembly is configured such that, in use, release of the compressing means causes the clamp members to become captively engaged within the docking formations against recoil pressure of the fuel cell stack arrangement such that the fuel cell stack arrangement is held captive in the compressed condition between the clamp members.