Thanks all.
I thnk the extra comments are now swaying me to be stronger with my in field thoughts - my actual views were clearer than these photos, but I could have done with getting a closer look really, hence a few photos to try and pick out a little more once home.
This bird was actively feeding on the ground, a flooded field, in the presence of Meadow Pipits, which all kept very separate and tended to be landing on posts, fences, and landing further up the field on a much drier part, this bird and one or two others were pretty much ground based, whereas the Meadow Pipits even left the area at times.
Another bird I did see did have more of a grey head and brown body combo, this bird seeming to be at a different stage of moult it would appear, but in the field did stand out as having a grey brown tone, very bright underparts, and did have a bit of a super going on, although I think maybe moult interfering a bit with this.
The confirmation that the legs don’t rule out Water, the observation of general bulkiness, together with my in field observations now make me happy to accept this bird as Water Pipit: not possible to confirm conclusively from the photos I accept, but I am grateful for the extra thoughts that make me go with my general feeling in the field this bird was indeed different to the numerous Mipits I saw.