Raptor taking off

Raptor taking off

Observation - Raptor taking off. Description: There is quite a large field behind our garden and I'm interested to know what kind of bird this is. I have a larger picture showing the bird about to land on the trainers arm if it would help

There is quite a large field behind our garden and I'm interested to know what kind of bird this is. I have a larger picture showing the bird about to land on the trainers arm if it would help