"After speaking to my girlfriend the next day in more detail about the sighting (after I'd sent the email) she said that it crossed from one side of the road to the other. It went across the road from left to right, running from one set of trees, onto the road and then through the broken fence into the darkness.
From the car it was about twenty meters away and the size was un-mistakenly bigger then a domestic cat and was no where near the same shape or had the same movement as a fox or other wild animals.
My girlfriend couldn't give a direct speed but said it moved fast and the colour was that of a shadow (dark) and she is absolutely convinced that it represented that of a Puma/Leopard.
If the animal was a domestic cat I'm sure that she would've missed it at this distance, she wouldn't of seen it with as much accuracy and she wouldn't of been as shaken up by the sighting."