The top part of the fronts and back are filled by a continuation of the sleeves.

In The Family Knitting Book, the picture is on the front cover and on page 79, which also has the start of instructions.
In the Chunky Jackets pamphlets, this is pattern 3, and is illustrated on the front cover and page 5 with instructions on page 6.

Materials
To fit Chest sizes
65/70, 75/80, 85/90, 95/100, 105/110 cms
26/28, 30/32, 34/36, 38/40, 42/44 ins
Finished measurement
74, 85, 94, 105, 114 cms
29½, 34, 37½, 42, 45½ ins
Length to top of shoulder
52, 58, 62, 66, 67 cms
20½, 22¾, 24½, 26, 26½ ins
Sleeve seam
38, 44, 48, 52, 52 cms
15, 17¼, 19, 20½, 20½ ins

Each pattern has a different set of recommended yarns. The following are from the Ladywood Chunky Jackets Pamphlet.

Materials
LADYWOOD Yarns
Double Double Knitting or
Pure Wool Shetland Chunky
11, 13, 15, 17, 19 balls
Cable needle
Open-ended zip fastener to fit front of jacket.