The pattern is written up for two different yarn weights, but as it’s a scarf it’s not really an issue.
The 10-row pattern gives a double sided scarf. It is well written and easy to follow. (The book contains 40 patterns of varying skill level, all easy to follow. Also has inspiration notes and great photos.
(Book also available in US, Canada, maybe elsewhere www.anovabooks.com ISBN 978-1-84340-5320)