Um...I'll try, but really I'm guessing.
As I understand it, you have no right to insist that you're NOT filmed by a camera crew (in a public place) - there is no right to privacy, as such, recognised by English law.
So, you can't do anything about them filming you if you walk past them (and presumably we're only talking about a fleeting glimpse in a crowd scene).
I'm not familiar with the Whatever and Patents Act, but what I suspect it says is that you may, in certain circumstances, have a right to payment if your image is shown. I imagine in circumstances like these you don't and they're just being extra careful.
I think you could only be deprived of any right to payment if there were express provisions in the Act that said displaying a notice was enough to deprive people of that right - in general, if a person has a right, they have to do something to waive it themselves, it can't be "waived for them" by the action of someone else.