Hi Ken,
There is no legal precedent for 'quoting' a photograph, per
Section 30 (1ZA) of the Copyright Designs and Patents Act 1988, so it's hard to be categorical about this. However on balance I think that merely using the images to illustrate a documentary, without some very close link between the subject matter of the images and the subject of the documentary would be problematic. Most professional film makers would recognise the need to clear rights before using other people's copyright works, just as they would expect the rights in their work to be respected.
The principle of fair dealing (which is the name of the UK doctrine) rests on something called the Berne Convention three step test. You can read a brief article on this on
Wikipedia, and googling the term will bring up many, more in depth, academic articles on the subject. On the basis of the second step of the test as applied to your case, the mere inclusion of the images in the documentary does not, of itself, amount to something which prevents or precludes you, for example, selling licences to other parties to use these photographs. To that extent it may be hard to say that the use in the documentary conflicts with your right to exploit the images more generally. I assume it is fairly unlikely that the images as they appear in the documentary would be capable of being captured in sufficiently high quality for subsequent use elsewhere, say on a website or in a book.
You are on stronger ground when it comes to the third step of the test which considers if there has been disproportionate harm to you as the rights holder in this specific instance, where you have been deprived of the opportunity to sell a licence to the film makers.
The matter of the citation is equally problematic. The law merely says that "the quotation [should be] accompanied by a sufficient acknowledgement (unless this would be impossible for reasons of practicality or otherwise)". Sufficient acknowledgement is defined in Section 178 as follows:
“sufficient acknowledgement” means an acknowledgement identifying the work in question by its title or other description, and identifying the author unless—
(a) in the case of a published work, it is published anonymously;
(b) in the case of an unpublished work, it is not possible for a person to ascertain the identity of the author by reasonable inquiry;
It would appear that the documentary makers have complied with this requirement by citing the original photographer, and do not need to credit your company as the current owner of the copyright.
I'm sorry that I can't be more certain about your overall position. If you feel it is worth it, you should consult a solicitor as I outlined in my previous reply, and let them view the documentary so that they can provide a more informed opinion. As I am not your legal advisor, I can't do that.