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I think you're right. As usual with your excellent photographs the flower shape is easily identified as almost certainly D. praetermissa. However, with orchids it's a good idea to have some shots of the leaves - spotting can be an important diagnostic as can leaf shape and position on the stem. And it usually means one can assess the thickness of the stem as well at the same time.
And I know I've said this before, but if you put you possible ID in "Identification" section then all the rest of us need to do is click the "Agreed" button. We can always add comments as well if necessary. It also gives you a chance to explain just why you think a particular ID might be correct.
Sorry, bit of a sermon!
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I agree with you and Chris, this is most probably the Southern Marsh-orchid.
A description of habitat also helps with the ID
Great close-ups, oeceanlis.
Expanding a bit on Chris M.'s comment:
I normally try to get at least three shots, the first one at distance, giving a clue to the habitat maybe, the next one showing the whole plant, showing density of spike etc etc., and then the detail shots, of which you made a very good job!
Lat/Lng: 52.2, -3.4
OS grid ref: SO0560