No mains I'm afraid, it will have to be run from 12v car / truck batteries (bearing in mind we are talking spring / summer).
If I'm cheeky, I can probably get a good idea of what I need from Maplin and then put it together myself. I am just unclear at present about the data recording aspect, or rather the best way to get the output from the camera to the hard drive, whether to look at wireless, or whether to go to a hard wired system.
If I went with a go-pro, I'd just get lots of shots of lovely yummy grass, nom nom nom nom.... my horse loves eating.
"Try not to punch any clowns"