Female Sparrowhawk or Kestrel?

I have sparrowhawks in my garden regularly but today had what I think is a female sparrowhawk but some friends think it may be a Kestral. Can anyone confirm if its a female sparrowhawk or a

kestrel? Thank you

 

https://www.flickr.com/people/156359183@N07/ 

https://www.flickr.com/photos/joanneshaw1967/