I had an unexpected surprise when I 'won' some Taylor and Francis vouchers on Twitter. One of the books I chose was Henry R Neave's Statistics Tables: For Mathematicians, Engineers, Economists and the Behavioural and Management Science.  In the preface to this second edition the compiler writes:

[Teaching statistics In the 1970s] I was unable to find any tables suitable for the course. So there really was no alternative but to develop a set myself (p.3).

One of the challenges of writing Statistics for Humanities was actually finding statistical tables which did not have a copyright on them or which were otherwise non-ambiguous in terms of intellectual property. Requests for information on twitter and mailing lists of copyright experts were inconclusive-- some stating that the tables belong to the persons who complied them and other citing 'fair use' or the view that ideas or numbers cannot be copyrighted.

Either way I'm now in possession of Neave's tables. This doesn't clear up the issue in any way, but I'm pleased to have a copy to hand.