I cannot speak to the Dutch or English but on the Scottish practice if one hasn't interacted with the work of David Hay Fleming from 120 years ago where he disputes Bonar's contentions along the same lines, they have not done their homework.From the link RJS posted above:
...
2. Did not the first Scottish, English and Dutch Psalters include uninspired hymns? Yes.
[FONT="]David Hay Fleming, “The Hymnology of the Reformation,” Original Secession Magazine (January-June and September 1884); repr.in An Anthology of Presbyterian & Reformed Literature 4 (1991) 223–246. [/FONT]