Jochen Fassbender produced a very useful printed index to commorate the issue of BGJ 100 in 1995. This covers the British Go Journal, from issue 0 (1967) to issue 100 (1995).
He then extended this in an online-only version to cover all issues up to issue 112 (1998).
This is available in two forms:
1. Word files, with a text introduction, for download:
The BGJ Archive provides online issues, articles and game records for all British Go Journals.