[R-sig-Geo] Converting shapefile from gridded to lat/ lng

[Steve Pickering]

Apologies if this seems a trivial one, but I know I'm missing something.

I am working with a shapefile of local authorities in England and
Wales (available here:
http://www.sharegeo.ac.uk/download/10672/330/Local%20Authority%20District%20Population%20for%20England%20and%20Wales%20-%20Census%202011.zip
)

The shapefile is in a gridded format, but I need to convert to a
conventional lat/ lng coordinates format, and then plot in the usual
way.

Can you help?  Many thanks!

library(sp)
library(maptools)
authoritiesMap = readShapePoly("LAD_Pop_EngWales2011")
plot(authoritiesMap)

 - Steve.

Steve Pickering
Assistant Professor
Kobe University
2-1 Rokkodai-cho
Nada-ku, Kobe
657-8501 Japan
pickering at penguin.kobe-u.ac.jp
http://www.stevepickering.net