Cracking capture but I'm near certain that's a Goshawk.
I've PM'd Cobra
Jim did indeed
the narrow bars on the chest ( just visible) and the white
flash over the eye says 99% Spar ( female) to me.
Its obviously an adult, older Gos's tend to get orange eyes, Spars tend to
get yellow eyes, ( though thats not a 100% guide )
and also flying
that close to the ground does give a little perspective to work from,
with the dried grasses.
A female gos would be around 4 times the size of a female spar
that is, Spars around 8-10oz female gos around 2lb - 2lb 2oz.
(males around 1lb 4oz to around 1lb 10 oz)
Obviously that means that 1% possibility its a Gos, but the lighter build and streamlined shape
says that its a Spar to me.
The "problem" with Gos's is that they are not a consistent colour, like the spars, they range from dirty brown through to silver grey.
Nicely caught BTW
Not wanting to hijack this thread but just to let peeps know why it's not so easy to tell the difference,
This is also a Goshawk.
Note the dark brown upper body, the yellow eyes with black pupils and the white eyebrows.