Bird of prey

Bird in Millbrook east Cornwall eating freshly killed pigeon. About 18''tall. Grey back with  fcouple white feathers on back, one on head. Allowed me to approach and sit 4ft away before resuming eating the pigeon. Carefully pulled out intestines and put them aside. Kept checking me out with piercing, evil looking yellow eyes. Front was white with black bars running from side to side. Thought it was Sparrowhawk initially but definantly white with black bars on front. Had fluffy, baggy legs and what looked red thin legs but after while looked more yellow once blood gone.

Can't identify it but what an honour for it to trust me to apprach and sit and watch(in the rain)  About an hour before could say anything other than Wow, Cor.

 

Anyone help in identifying,  looked like very small Goshawk?