A blank (3C; 3D) for forming a container, the blank comprising: a central portion; an outer edge; and a marginal portion between the outer edge and the central portion, the blank comprising a radius extending from a center of the blank to the outer edge, the marginal portion comprising a plurality of radial score lines (47, 49; 57, 59) having an angular spacing between respective adjacent radial score lines, the plurality of score lines comprising a plurality of first score lines (47; 57) and a plurality of second score lines (49; 59), the first score lines (47; 57) each having a respective first length (L5; L7) and the second score lines (49; 59) each having a respective second length (L6; L8), the first length (L5; L7) being less than the second length (L6; L8), the blank (3C; 3D) has a first, machine direction, along which the blank may be fed into a forming tool, and a cross-direction that is perpendicular to the first direction, the marginal portion has a first cross-direction portion at one cross-directional end of the blank, a second cross-direction portion at a second cross-directional end of the blank, a first machine-direction portion at one machine directional end of the blank, and a second machine-direction portion at a second machine-directional end of the blank, characterised in that the blank (3C; 3D) comprises weakening features in each of the first cross-direction portion and the second cross-direction portion and strengthening features in each of the first machine-direction portion and the second machine-direction portion, the weakening features and the strengthening features being for strengthened resistance of the blank to stretching in the first machine-direction portion and the second machine-direction portion as compared to the first cross-direction portion and the second cross-direction portion, the weakening features comprise the plurality of first score lines (47; 57) and at least a portion of the plurality second score lines (49; 59), the strengthening features comprise at least a portion of the plurality of second score lines (49; 59), and the strengthening features are free from any of the first score lines (47; 57) in the first machine-direction portion and the second machine-direction portion. a central portion; an outer edge; and a marginal portion between the outer edge and the central portion, the blank comprising a radius extending from a center of the blank to the outer edge, the marginal portion comprising a plurality of radial score lines (47, 49; 57, 59) having an angular spacing between respective adjacent radial score lines, the plurality of score lines comprising a plurality of first score lines (47; 57) and a plurality of second score lines (49; 59), the first score lines (47; 57) each having a respective first length (L5; L7) and the second score lines (49; 59) each having a respective second length (L6; L8), the first length (L5; L7) being less than the second length (L6; L8), the blank (3C; 3D) has a first, machine direction, along which the blank may be fed into a forming tool, and a cross-direction that is perpendicular to the first direction, the marginal portion has a first cross-direction portion at one cross-directional end of the blank, a second cross-direction portion at a second cross-directional end of the blank, a first machine-direction portion at one machine directional end of the blank, and a second machine-direction portion at a second machine-directional end of the blank, characterised in that the blank (3C; 3D) comprises weakening features in each of the first cross-direction portion and the second cross-direction portion and strengthening features in each of the first machine-direction portion and the second machine-direction portion, the weakening features and the strengthening features being for strengthened resistance of the blank to stretching in the first machine-direction portion and the second machine-direction portion as compared to the first cross-direction portion and the second cross-direction portion, the weakening features comprise the plurality of first score lines (47; 57) and at least a portion of the plurality second score lines (49; 59), the strengthening features comprise at least a portion of the plurality of second score lines (49; 59), and the strengthening features are free from any of the first score lines (47; 57) in the first machine-direction portion and the second machine-direction portion.