Update:May, 2019 -
Rowan has revised the pattern to include yarn options for Felted Tweed, Cashmere Tweed and Softyak DK, in English only.

Because each knitter may have their own shade combination preferences, here are the yardages for each yarn based on 2 shades.

Felted Tweed - suggested shades Ancient 172 and Stone 190.
Shade A (replacing Summerspun) -
Felted Tweed - 6(7, 8, 8, 8, 9, 10) balls
Shade B (replacing Revive) -
Felted Tweed - 5(5, 5, 5, 6, 6, 6) balls

Cashmere Tweed - suggested Yorkshire 013 and Oats 001.
Shade A (replacing Summerspun) -
Cashmere Tweed - 13(14, 15, 17, 17, 18, 19) balls
Shade B (replacing Revive) -
Cashmere Tweed - 9(9, 10, 10, 12, 1212) balls

Softyak DK - suggested Plateau 239 and Taupe 245.
Shade A (replacing Summerspun) -
Softyak DK - 8(9, 10, 11, 12, 12, 13) balls
Shade B (replacing Revive) -
Felted Tweed - 6(6, 7, 7, 8, 8, 8) balls

From the Knit Rowan website:
Knit this mans patterned cardigan. Designed by Lisa Richardson using the lovely combination of Summerspun (cotton and wool) and Revive (cotton and silk), the stunning geometric pattern on this cardigan is knitted using the fairisle technique and the garment has deep rib edgings, a turn back collar and square set in sleeves.

Finished dimensions:
51.5: 55: 58: 61.5: 63: 65.5: 69 cm
20½: 21½: 23: 24: 25: 26: 27 inches

Yarn information:
Summerspun
A - Maida Vale 118
9, 10, 11, 12, 12, 13, 14 skeins
1179, 1310, 1441, 1572, 1572, 1703, 1834 yards

Revive
B - Rock 465
6, 6, 7, 7, 8, 8, 8 skeins
822, 822, 959, 959, 1096, 1096, 1096 yards

Extras:
QTY (5) buttons
Buttons are not listed in pattern