The title of Sinclair's (1991) book should be "Corpus - Concordance- Collocation", in the order of how collocations are extracted. Not sure why he put collocation in front of concordance.
Also in my recent personal communications with Sinclair, he appears to have changed his ideas over time on some points, especially those related to corpus design. The book reflected what people thought of corpora at that time. But now much has changed. Is there a need to stick to something produced 15 years ago?