About the size of a starling 20cms very distinct yellow stripe short beak for a snipe
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I agree with Roy. On jizz, this looks far more like a Common Snipe. It is quite deep-bodied (even given poor weather 'fluffing-up') and the head pattern, such as it is visible, looks more like Common Snipe.
Jack Snipe tends to have a more 'crouched' posture.
Not a great picture from which to be sure, though.
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I agree this has the general look of a snipe, and I don't think it is short-billed enough to be jack snipe. The face pattern is hard to pick out clearly, but if it was a jack snipe, I think you'd still be able to see double supercilium of the jack snipe (jack snipe shows this very broad pale stripe above the eye, with a black line within it, dividing it into two).
Lat/Lng: 50.8017479, 0.2966209
OS grid ref: TQ619027
In the garden in clear patch of grass under a fir tree