Thanks Si. The thing is slinky is very sly in that it won't give me a pattern where I can intercept. Also the farm doesn't have lights on. There is one property with IR sensor lights but I've not seen the fox near there.
As the morning get lighter I might just be revealing a slight pattern. All winter I've managed to get some photos in a particular place at a time and place I'm seeing it at first light now. I don't mind getting up early anyway. I love how different the country, wildlife and light is at first thing.
While on the subject, what is the type of IR the clever ones