spelling mistakes in a GCSEstandard textbook - should I write and correct them? or am I being incredibly sad?

[harpsichordsahoy]

I have been teaching some GCSE Child Development classes and the standard issue textbook is riddled with errors, some of them really fundamental. For example, in the chapter about birth Caesarean is spelt incorrectly, as is Entonox. Also reflex spelt as relex. The book is in its 6th edition.
Should I write to the publisher and complain or will I look like a sad and lonely women with nothing better to do with my time?
AIBS?

[twentypence]

Tell them or the seventh edition will be pants.