I used Hugin to make a super-set combined matrix map
from these 1885 maps of London, which vary in both scale and rotation
angle (to fit the parliamentry ward on the pages nicely)
http://www.londonancestor.com/maps/maps.htm
(Boundary Commission Maps, 1885.
London Borough Maps)
It was easy, annd the result (using Hugin's masks
to clip out the various scales and compass marking on the
separate maps) is superb.
My thanks to the Hugin community.
BugBear