Thanks for the link - looks interesting.
The page for "Scottish Reformation Society" (see link on left) has this:
The Scottish Reformation Society
The Scottish Reformation Society was founded in 1851, following a protest against the re-establishment of the Roman Catholic hierarchy in England. The original constitution of the Society set out its objectives as being “to resist the aggressions of Popery; to watch the designs and movements of its promoters and abettors; and to diffuse sound Scriptural teaching and information on the distinctive tenets of Protestantism and Popery”.
To these aims, the Society has maintained and promoted a faithful witness to the present time. A quarterly magazine, the Bulwark, is committed to the same principles as the Society and the material is drawn from a wide source of Reformed teachers and writers past and present.