Ed, great picture, thanks.
Chris, further to what Andrew wrote, I'd say LPOP stands for Local Pattern Observation Post. Many types of armoured vehicles were turned into OP's, e.g. Sherman and Ram tanks, but also Universal Carriers. In this case LP refers to the locally built version of the "Carrier, Wheeled, NZ Pattern Mk II"
Also see
http://www.mapleleafup.net/forums/sh...137#post106137