hindle-a I'm afraid it doesn't help. The link, other than the obvious one, between the unclued lights still eludes me. I don't usually find Doc so elusive.
I'm struggling with this .I don't have a Brewers and apart from the obvious one unclued light I'm lost .I've tried the Bartleby link but even typing Literary Placenames as you suggest Roslyn gets me nowhere . It just comes up "no documents match the query " .I think I'm going to ditch it this week :)
Many thanks for the link, DJA. If anybody is still having problems confirming all the unclued entries, one of them (in 18th edition of Brewer, at any rate) does not appear under "Literary place-names" but is given at another entry mentioned in the first paragraph thereof.