Thanks for looking David
Yes it knew I was there, from what I have read about them, having their ears back simply means they are alert.
They soon accept your presence, I have often sat just a few yards away from them, sometimes for over an hour, some will up and run off as they watch you approach (using my car as a hide) but some don't, when they realise you aren't threatening they often just go back to sleep. (which doesn't make for good photo's)
Paul