Here...
139 results, or you can search for waiver and get a hundred or so different results. And you can search
here and get several hundred additional results. Most of them talk about waiving the right to representation, a court trial, or the right to prosecute; but there's other rights in there as well, and they are all "legal rights." One of the results that can be found is a practical guide to admissibility criteria where it discusses the nature of a right. A quote from that section:
"Article 6 (right to trial, i.e. the case would be heard) applies to proceedings involving civil party complaints from the moment the complainant is joined as a civil party, unless he or she has waived the right to reparation in an unequivocal manner." (the waiving of a right is the waiving of "the right to reparation" should that right be "violated" in a manner that was waived)
Here's a UK law firm explaining some of the
considerations of a legal waiver.
I don't see anywhere in the UTCCR (1999) that says anything that waives a legal right will be automatically discarded... where is that?
It does say any such waiver has to be explicit and of some reasonable benefit to the individual signing it. So no generic "blanket waivers;" and no "model release" from someone you just walked up to and asked to sign would be recognized as valid.
One of the principles of a right is that it's yours to control as you see fit, and that includes the waiving of that right. There are instances where the law explicitly says you cannot waive a particular right because it cannot be in your favor to do so. And there are laws limiting "how" a right can be waived (sold/transferred/assigned/etc) to prevent someone from doing something stupid (i.e. you cannot get a liability waiver to protect you in the event you are negligent).
If you could not sell, assign, transfer, or otherwise "waive" a right you (almost) couldn't "legally" sell a photograph, but of course you can. And the
UK law even says you can waive your rights using the term "waived."
A right that is explicitly/legally waived (meeting the previously noted requirements) is binding and cannot be retracted. You can't just "change your mind" unless a) such verbiage allowing a change/limiting the waiver is incorporated or b) the waiver is for a minor in which case the individual who's rights were waived can retract the waiver upon reaching legal age....
I could find you UK specific legal references for that as well, but I'm not going to; it's not my problem.
I'm not saying that it's a good idea to tell a client to stuff it because they signed a waiver, that's a business decision. And anything can be challenged...
I'm also not saying you need a waiver/"model release" in most cases. Even over here, where everyone gets them for everything, you don't typically *need* one.