I came across this picture:
while wandering around Commons.
The accredited source is the UK National Archives and as far as I
understand this page:
Reproductions of images on the website are not permitted without
acquitting a fee.
However, I am not familiar with public domain policy stuff in the UK,
it could be that there are twists I don't know about, so I am asking
for some enlightenment as to whether this image should stay or go.
NB. This address is used for mailing lists. Personal emails sent to
this address will probably get lost.