In my opinion, I think you are legitimate. Googled alot of your work/Facebooked you. The thing is though, it is almost a weekly occurrence that an animal rights activist/vegan/RSPCA follower joins up and asks something similar or tries to get some "dirt" on hunters to use in anti-hunting stories etc. Everyone who read that first post thought the exact same thing. Also, "I actually work for an agency who supply images to all areas of the media" is the bit that would worry anyone who gave it a second thought. Not having a go at you or anything, just saying that being a minority group, we are not going to shoot ourselves in the foot.