I think most of us are leaning towards Grey Wagtail as the other two should have more solid yellow with no traces of white and are unlikely to nest there although could pass through on migration if blown off course. Feldeggs are regular migrants here (Eastern Spain).
I would not discount Yellow Wagtail, either thunbergi or feldegg sub-species, which have respectively black or dark grey heads, or even a Grey Wagtail. Did you see the throat colour?
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