It's a "grey" juvenile Little Stint, one deficient in feather coloring. The head pattern, lacking a distinct capped effect and any dark wash to the ear-coverts, coupled with a rather whitish forehead (contra Semi-p) and a diffuse split here reaching back over the eye are all Little Stint. Lack of any breast markings, or restricted breast markings at the carpal are also Little Stint.
One other obvious things to my eyes, favoring Little Stint, is the amount ox exposed primaries, good for Little but probably not typical of Semi-p.
The upperpart feathers also show the whitish tramlines on the mantle and also on the outer fringes to the scaps, again good for Little and not good. The dark centres to the rear lower scapulars are "hour-glass" shaped and rather solid, again, good for Little and not Semi-p.
The third shot I jus saw, shows no semipalmations, which clinches the id.
Semi-ps occurr in "grey" morphs too, and I agree if I had seen this bird, I would definitely need to rule Semi-p out. It would probably get passed off here in the US as a Semi-p unless you were specifically looking for Little Stint.
Overall, the clean, pale look to the face and greyish crown initially point in favor of Little rather than Semi-p, since even grey-ones here still have dark crowns, darker ear-coverts etc.
Good challenge!