A recuperator comprising: a heat exchange assembly comprising at least one heat exchange cell (105, 300), said cell (105, 300) comprising two heat exchange plates; an inlet for a first gas, and an outlet for said first gas; an inlet for a second gas and an outlet for said second gas; a plurality of first gas channels extending along a plurality of first paths between the inlet for the first gas and the outlet for the first gas; a plurality of second gas channels (204, 303) extending along a plurality of second paths between the inlet for the second gas and the outlet for the second gas; wherein said inlet for said first gas, said outlet for said first gas, said inlet for said second gas, and said outlet for said second gas are all located on or near to a main central length axis of the recuperator; said plurality of first gas channels are arranged side by side with and follow said plurality of second gas channels (204, 303), such that said first gas flowing in said plurality of first gas channels flows adjacent said second gas flowing in said plurality of second gas channels (204, 303), said first and second (204, 303) gas channels being separated by at least one of said heat exchange plates such that heat transfers through said heat exchange plate between said first and second gases; wherein said first and second (204, 303) gas channels are arranged in a contra-flow arrangement whereby said first gas flows in said plurality of first gas channels in an opposite direction to said second gas flowing in said plurality of second gas channels (204, 303); said cell (105, 300) comprises a first substantially flat region (205, 305) at a first end of said cell (105, 300), and a second substantially flat region at a second end of said cell (105, 300); and each of said first and second gas channels (600, 204, 303) extend between said first (205, 305) and second substantially flat regions, said cell (105, 300) has an inlet (201, 301) for said second gas, in one end of said cell, wherein said cell (105, 300) comprises a raised formation around said inlet (201, 301) for said second gas, characterised in that: said inlet (201, 301) for said second gas is shaped to outflow and aid the distribution of the second gas in a relatively even manner in a centre section of said cell (105, 300), said raised formation comprises circular portions around a perimeter of said inlet (201, 301) for said second gas and a peripheral lip portion (212, 901) between said inlet (201, 301) and the plurality of second gas channels (204, 303), for preventing the second gas from short circuiting across the smallest gap from said inlet (201, 301) to fill the outermost second gas channels, the second gas flows around the circular portions and around the peripheral lip portion (212,901). a heat exchange assembly comprising at least one heat exchange cell (105, 300), said cell (105, 300) comprising two heat exchange plates; an inlet for a first gas, and an outlet for said first gas; an inlet for a second gas and an outlet for said second gas; a plurality of first gas channels extending along a plurality of first paths between the inlet for the first gas and the outlet for the first gas; a plurality of second gas channels (204, 303) extending along a plurality of second paths between the inlet for the second gas and the outlet for the second gas; wherein said inlet for said first gas, said outlet for said first gas, said inlet for said second gas, and said outlet for said second gas are all located on or near to a main central length axis of the recuperator; said plurality of first gas channels are arranged side by side with and follow said plurality of second gas channels (204, 303), such that said first gas flowing in said plurality of first gas channels flows adjacent said second gas flowing in said plurality of second gas channels (204, 303), said first and second (204, 303) gas channels being separated by at least one of said heat exchange plates such that heat transfers through said heat exchange plate between said first and second gases; wherein said first and second (204, 303) gas channels are arranged in a contra-flow arrangement whereby said first gas flows in said plurality of first gas channels in an opposite direction to said second gas flowing in said plurality of second gas channels (204, 303); said cell (105, 300) comprises a first substantially flat region (205, 305) at a first end of said cell (105, 300), and a second substantially flat region at a second end of said cell (105, 300); and each of said first and second gas channels (600, 204, 303) extend between said first (205, 305) and second substantially flat regions, said cell (105, 300) has an inlet (201, 301) for said second gas, in one end of said cell, wherein said cell (105, 300) comprises a raised formation around said inlet (201, 301) for said second gas, characterised in that: said inlet (201, 301) for said second gas is shaped to outflow and aid the distribution of the second gas in a relatively even manner in a centre section of said cell (105, 300), said raised formation comprises circular portions around a perimeter of said inlet (201, 301) for said second gas and a peripheral lip portion (212, 901) between said inlet (201, 301) and the plurality of second gas channels (204, 303), for preventing the second gas from short circuiting across the smallest gap from said inlet (201, 301) to fill the outermost second gas channels, the second gas flows around the circular portions and around the peripheral lip portion (212,901).