Not sure about this, but I think it is a Snipe.
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The general shape and long bill indicate it is likely to be either a snipe or woodcock. Usually it is easy to tell them apart as the snipe is much smaller than the snipe, but there are no size references in your photo.
Therefore, we need to use the markings. The random indistinctive markings on the wing and the pale stripes on the head indicate snipe. Also the 'jizz', the way it stands, body shape and overall look say snipe.
It appears to be a dark bird, but that could be due to the light.
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I agree its most likely a snipe but it does look rather large compared to that seat in the background. Come across loads of snipe each year when doing our wet grassland surveys and they give the impression of being significantly smaller than than this meaty beast.
I agree about the size, my first thought was woodcock but if you download the picture and blow-up it up you can see the markings better. It must be an optical illusion.
I have added some more photo's that might help.
I did have to zoom my camera for the shot which may be why it look odd. We thought it's size was larger than a Blackbird but smaller than Rock Dove.
Wildlife of Assynt
How about Great Snipe - bit bigger and meatier than common snipe, can just hear all those twitchers getting their engines running to rush up there and stake out your garden as I think they are rarely seen in UK.
Suspect not, most likely Snipe as you originally suggested. Perhaps you'll spot it again as they can be common in damp grassy areas.
Oh if only it were a great snipe!
The other pictures show the tramlines down the back and the head markings much clearer - it is a snipe, I wish I had snipe in my garden.
The tramlines on the back are so pale compared to the body colour and the body colour is so dark I do wonder if this is not a melanistic individual.
Keep your eyes open and assess if this is darker than any other snipe you get. As Mike said snipe tend to have favourite places and are likely to return.
Lat/Lng: 58.1, -5.3
OS grid ref: NC0720