I hesitate to correct a correction to a factual error in the review recently posted since we appreciate the suggestion that the extracts in The King in His Beauty could be of daily devotional use.My understanding, drawn from a number of reliable sources, is that the Westminster Assembly first of all met in the Lady Chapel (built by Henry VII) in Westminster Abbey.
During the winter of 1643 they moved to the warmer surroundings of the Jerusalem Chamber, where they remained. Robert Baillie gives a first hand report: "The like of that Assemblie I did never see, and, as we hear say, the like was never in England, nor any where is shortlie lyke to be. They did sit in Henry the 7th's Chappell, in the place of the Convocation; but since the weather grew cold, they did go to Jerusalem chamber, a fair roome in the Abbey of Westminster, about the bounds of the College fore-hall, but wyder"
St. Margaret's was the location for the services held in connection with the Fast Days of the Westminster Assembly and the Fast Days appointed by the Long Parliament. It was here, rather than in the Houses of Parliament, that the Divines preached before the Parliamentarians. The King in His Beauty states that Rutherford preached before the Long Parliament and that the Westminster Assembly met in Westminster Abbey.