What about Architecture in Britain 1530-1830 by John Summerson, 9th ed., 1993?
This has a chapter called The Rebuilding of London: the City Churches. Other
possibly interesting chapters: Wren and his Contemporaries; Churches and
Universities. The bibliography for Rebuilding of London chapter includes
these citations:
Birch, G.H. London Churches of the 17th and 18th Centuries, 1896.
Cobb, G. The Old Churches of London, 1941-2.
Godwin, G. The Churches of London, 2 v., 1838-9
Summerson, J. Drawings of London Churches in the Bute Collection: a Catalogue,
in Architectural History, 13, 1970
Wren Society, vols. 9 and 10.
I did not look at any of these, so have no idea as to their actual
helpfulness. Suggestions, only.