There are separate instructions for a Girl’s Cardigan and for a Boy’s Cardigan.

Measurements
To fit chest or bust sizes
55, 60, 65, 70, 75 cm
(22, 24, 26, 28, 30 in)
Finished Measurement
60, 65, 70, 75, 80 cm
(24, 26, 28, 30, 32 in)
Length to shoulder
35, 39, 43, 47, 51 cm
(14, 15½, 17, 18½, 20 in)
Sleeve seam
26, 30, 35, 39, 43 cm
(10, 12, 14, 15½, 17 in)

Each pamphlet has a different set of recommended yarns. The following are from the King Cole version.

Materials
KING COLE Double Knittings
Mix’n’Match Double Crepe
Main Colour (M) 3, 3, 4, 4, 5 balls
Colour A 2, 2, 2, 3, 3 balls
Colour B 1, 1, 1, 1, 2 balls
Carelon, Speedy, Superspun Superwash, Pretty Lady, Crepe Delite, or Gren Nylon
Main Colour (M) 6, 7, 8, 10, 11 balls
Colour A 4, 5, 5, 6, 7 balls
Colour B 2, 2, 2, 3, 3 balls
5, 5, 6, 6, 6 buttons.