Haraka
According to Derek Wood in the 1990 reprint of 'Project Cancelled' (Chaper 16), The 1976 Yearbook had a couple articles that were very close to the bone as far as the MOD was concerned. The forward by the CAS at the time was removed and Wood's own article, 'Wings Clipped and Cancelled' had arbitrary changes done to it, plus other text changes were done throughout the publication. Wood doesn't say if the publication had already gone on sale, but he does say is that many thousands of copies were withdrawn and pulped.