Escaped raptor?

Observation - Escaped raptor? - UK and Ireland. Description: No photo I am afraid. Driving near Talley yesterday, I saw two Red Kites mobbing a larger, raptor-like bird. I stopped the car to get a better look, but the birds were silhouetted against the Sun, so I couldn't see much detail, I did however, hear a bell

No photo I am afraid. Driving near Talley yesterday, I saw two Red Kites mobbing a larger, raptor-like bird. I stopped the car to get a better look, but the birds were silhouetted against the Sun, so I couldn't see much detail, I did however, hear a bell when the birds were closest. The mobbed bird seemed to be either an eagle or a vulture. Does anyone know of a raptor escapee in West Wales ?