I've been searching for a difference in the corrected edition of the New English Bible for a while now. Today I finally found (was given) one! I read it in an excellent post on the New Epistles Blog. Rather than steal thunder from his neat post, I'll just let you read it and say the corrected edition difference is is in his second example. The example there is from the original NEB and was changed in the 1972 edition.
The 1970 and 1972 editions appear to be identical. Other than the "corrected edition" copyright date in the front, I would have thought they were from the same printing. But this one small change is squeezed into the same space on that line.