It is extemely important that The Second London Confession (SLC), when it came to the section "Of Gods Decree," did not reproduce The Westminster Confession (WCF) holus-bolus. Chap. 3 of the WCF has eight paragraphs. Chap. 3 of the SLC has only seven. One, that on reprobation, has been entirely omitted. The WCF essentially reproduced the doctrine of double predestination that was part of the strong Augustinian tradition that ran from Augustine through the Venerable Bede (c.673-735) and Gottschalk (c.804-c.869) to the Reformers. The authors of the SLC, however, embraced a milder Augustinianism.
This needs exploring by someone in more detail!