Hi,
1. Ignore them (pity)
2. Upload them as public domain and re-iterate the
National Portrait
Gallery issue, and teach them that these open content wiki people are not
to be trusted
3. Label them CC-BY so the Wellcome Trust can get a mandatory attribution,
which we would do anyway
Personally, I'd go for #3. CC-BY is just one small step up from PD, so I
really don't see the practical harm.
This is not the first time the Commons community deals with such a
situation ; I believe standard practice is to use {{Licensed-PD-Art}} [1]
which states both #2 & #3.
See for example its use for {{PD-Art-Yale}} [2]
*(“Wikimedia Commons: there’s a template for that.”)*
[1] <https://commons.wikimedia.org/wiki/Template:Licensed-PD-Art>
[2] <https://commons.wikimedia.org/wiki/Template:PD-Art-Yale>
Hope that helps,
--
Jean-Frédéric