No it wasn't.
For some reason although the pack file is called LME1.4.1, Mod Manager was picking it up as LME1.4 and so generated a script file showing it as such. (See below)
I've now manually corrected the User Script file and tried again but still can't see any change, everything still looks just like vanilla.
User.Script now reads
mod "LME_Camp1.pack";
mod "LME1.4.1.pack";
mod "LME_texture.pack";
Oh! and I had downloaded and installed the start.pos, but I ran the install .exe again just to make sure.
STOP PRESS!!!
I've just noticed something. I went into a Land Battle and noticed that my Austrian units looked larger than usual. So, I carefully counted the men in one and it had 160, even though its unit card said it only had 120.
So, it looks like something has changed but not everything. I didn't notice before because I was looking at the units on the Campaign Map.