Competitors at equestrian events are the worse for this type of thing. (In my opinion).
When I contacted one person about nicking my images (if she liked them so much, why didin't she buy them on the day)


she actually wrote back along the lines of:
My uncle is a photographer and he is well aware that people take his images off his website or facebook. He's fine about it and so should you be. I have done nothing wrong in using your images. By the way, when
I asked you to take photos of my younger sister, did you get my parents permission as she is a minor and my uncle said you have broken the law by taking photos of her without her parents permission. I have also been to see a solicitor (she names them) and I have been advised that I am perfectly at right to use images of myself and my sister from your website or facebook'.
That is more or less what she replied to me. Cheeky swine. Anyway, after reporting her to facebook, the images were quickly removed
Lisa