We don't have the full story yet, but it may be an escaped bird.
Here's the BBC story.
Keep an eye on reports at Ceredigion Birds.
Wow - I wish I was at the cottage to catch a glimpse of that!
I just found this website with an image to give you the sense of scale - this is a Red Kite with the juvenile Golden Eagle!
For more detail about identifying Eagles, sighting reported, etc - try the Bird Guides here.