The hedge that runs away up the field from the gated entrance usually have the odd yellowhammer so maybe thats what it was.
Thanks both. That was my first thought, and I was keen to find it if so because I haven't seen one yet this year.
Josh - are those the horse fields up the hill from the causeway? I'll have a look up there next time I'm over if so.
Yes Rob, you should find the Yellowhammers around a small scaffolding kind of structure towards the end of the pathway heading to Upper. They've been feeding on the floor and have enabled close viewing recently.