A cathode or anode flow field plate (120, 130), for use in a fuel cell, the flow field plate (120, 130) being generally planar and having front and rear faces, wherein the flow field plate (120, 130) includes at least one first gas inlet aperture (136, 140, 156, 160) and at least one first gas outlet aperture (137, 141, 157, 161), and wherein on the front face of the flow field plate (120, 130) there is provided a plurality of inlet distribution channels (170, 186) in communication with the first gas inlet, a plurality of outlet collection channels (171, 187) in communication with the first gas outlet and a plurality of primary channels (172, 188) extending between gas distribution channels and said outlet collection channels (171, 187), wherein each of the gas inlet distribution (170, 186) and gas outlet collection flow channels (171, 187) is connected to a plurality of the primary channels (172, 188), and wherein the flow field plate (120, 130) includes, for at least one of the apertures, an aperture extension (181, 281) extending on the rear side of the flow field plate (120, 130), and for each aperture extension (181, 281) at least one slot associated therewith and extending through the flow field plate (120, 130) from the rear side to the front side thereof, to provide communication between the corresponding aperture extension (181, 281) and a corresponding one of said plurality of inlet distribution channels (170, 186) or said plurality of outlet collection channels (171, 187), and further comprising at least one of: a) a plurality of first gas inlet apertures (136, 140, 156, 160) and a plurality of first gas outlet apertures (137, 141, 157, 161), b) wherein on the flow field plate (120, 130), along the longitudinal direction of the primary channels (172, 188), each of the plurality of primary channels (172, 188), relative to the corresponding inlet distribution channel (170, 186) and the corresponding outlet collection channel (171, 187) has one end thereof spaced at a distance from said inlet distribution channel (170, 186), and the other end thereof spaced at the same distance from said outlet distribution channel (171, 187), and wherein the ratio of the distance to the width of the primary channels (172, 188) is in the range of 1.5 -2 or more, and c) wherein the inlet distribution channels (170, 186) and the outlet distribution channels have fillets. a) a plurality of first gas inlet apertures (136, 140, 156, 160) and a plurality of first gas outlet apertures (137, 141, 157, 161), b) wherein on the flow field plate (120, 130), along the longitudinal direction of the primary channels (172, 188), each of the plurality of primary channels (172, 188), relative to the corresponding inlet distribution channel (170, 186) and the corresponding outlet collection channel (171, 187) has one end thereof spaced at a distance from said inlet distribution channel (170, 186), and the other end thereof spaced at the same distance from said outlet distribution channel (171, 187), and wherein the ratio of the distance to the width of the primary channels (172, 188) is in the range of 1.5 -2 or more, and c) wherein the inlet distribution channels (170, 186) and the outlet distribution channels have fillets.