A multipoint injection system comprising: a manifold extending in a circumferential direction wherein a plurality of flow passages each having a main portion defined through the manifold in the circumferential direction, wherein the flow passages are in fluid isolation from one another and are spaced apart from one another in an axial direction along an axial width extending from a first axial end of the manifold to a second axial end of the manifold; and a plurality of feed arms extending radially inward from the manifold, wherein feed arm portions of the flow passages extend through each of the feed arms, wherein the feed arm portions of the flow passages are within the axial width of the manifold; and characterised in that : a first one of the flow passages of the manifold is axially closest of the flow passages to the first axial end of the manifold and is in fluid communication with a first one of the feed arm portions that is axially closest of the feed arm portions to the first axial end of the manifold, wherein a second one of the flow passages of the manifold is axially adjacent to the first one of the flow passages and is in fluid communication with a second one of the feed arm portions that is axially adjacent to the first one of the feed arm portions, wherein a third one of the flow passages of the manifold is axially adjacent to the second one of the flow passages and is in fluid communication with a third one of the feed arm portions that is axially adjacent to the second one of the feed arm portions, and wherein a fourth one of the flow passages of the manifold is axially closest of the flow passages to the second axial end of the manifold and is axially adjacent to the third one of the flow passages and is in fluid communication with a fourth one of the feed arm portions that is axially closest of the feed arm portions to the second axial end of the manifold and that is axially adjacent to the third one of the feed arm portions. a manifold extending in a circumferential direction wherein a plurality of flow passages each having a main portion defined through the manifold in the circumferential direction, wherein the flow passages are in fluid isolation from one another and are spaced apart from one another in an axial direction along an axial width extending from a first axial end of the manifold to a second axial end of the manifold; and a plurality of feed arms extending radially inward from the manifold, wherein feed arm portions of the flow passages extend through each of the feed arms, wherein the feed arm portions of the flow passages are within the axial width of the manifold; and characterised in that : a first one of the flow passages of the manifold is axially closest of the flow passages to the first axial end of the manifold and is in fluid communication with a first one of the feed arm portions that is axially closest of the feed arm portions to the first axial end of the manifold, wherein a second one of the flow passages of the manifold is axially adjacent to the first one of the flow passages and is in fluid communication with a second one of the feed arm portions that is axially adjacent to the first one of the feed arm portions, wherein a third one of the flow passages of the manifold is axially adjacent to the second one of the flow passages and is in fluid communication with a third one of the feed arm portions that is axially adjacent to the second one of the feed arm portions, and wherein a fourth one of the flow passages of the manifold is axially closest of the flow passages to the second axial end of the manifold and is axially adjacent to the third one of the flow passages and is in fluid communication with a fourth one of the feed arm portions that is axially closest of the feed arm portions to the second axial end of the manifold and that is axially adjacent to the third one of the feed arm portions. <EOS>