1855 with additions
1856
1857
1858. This was revised by Shenton [who had helped write the Handbook to the Portrait Gallery.
This shortened version was used till at least the 1880's, with further revisions.
I wonder what the main differences are between all (5) editions? The edition I have (one of the later editions) mentions a Canadian Court, Library and Reading Room near the Centre Transept. Also mentioned is a picture gallery in the north wing, whereas the first edition described something to do with soil (Terry mentions it in his Walk Through the Nave). I think it would be worthwhile to do a comparison between all editions and see how different parts of the palace evolved during the first few years.