Hi Chris,
Definitely a juv.Sparrowhawk!I think that I can make out the rusty fringes to some of the mantle feathers in the second shot!
Structure/legs/head pattern etc not right for Gos.
Anyway,I had some very recent close experience with juv.Sparrowhawk,and I've just realised that I have yet to relate the tale to the forum:
On Monday last I was upstairs when I heard a loud thud on the kitchen window.I went down,half expecting to see a Sparrowhawk in the garden,but as I opened the door between the kitchen and the "hall"(there is a small hall between the kitchen and the bathroom,with the back door between both rooms)I was surprised to flush a Sparrowhawk from inside my house!(the back door had been open for ventilation)
The intended prey(a feral pigeon)remained in the house,a little dazed,but it hadn't allowed for the tenacity of Accipiter nisus!
The Sparrowhawk didn't actually flush all that far,merely flying up on to the bathroom roof to wait.When the pigeon DID fly out,it had no chance...
It then stayed in the garden for 2 1/2 hours or so,plucking and eating the pigeon.I took a few photos(the bird was not far from the house),and may scan a few if they come out well.Aged/sexed as a juvenile female.
Harry H