Many thanks for the map link, I had not seen that book or map before.
The National Library of Scotland has an amazing online collection of zoomable OS maps,
https://maps.nls.uk/os/townplans-england/index.html (just drag the purple outline map and use the scroll wheel zoom in and to find the map that you require, then click on the relevant one, the available maps pop up top right, click on the one you require). Enjoy!
Frustratingly the 1875 Town Plan sheet showing this section of the town is missing, the one to the north showing Wellington Square and the northern part of the Castle is at
https://maps.nls.uk/view/229917273 The link to the town plans is
https://maps.nls.uk/os/townplans-england/The Hastings map that I looked at, and took the street names from, was the 25 inch OS maps
https://maps.nls.uk/geo/find/#zoom=7.0& ... &point=0,0Actual map 1892
https://maps.nls.uk/view/103674748 again frustratingly there is similarly no copy of the 25" 1872 map in the NLS collection.
Hope that these links help you and other members.