I have just received a LR with the smaller text. Both my existing larger text and this one have smooth inside roofs, with circular downstands (suggestive of an unused provision for a beacon, like those found for example in the USA police cars). Also the circular ridge on the hubs on the earlier one is narrower (this can also been seen on Jan Werner's side views above). I've looked at some other of my Dinkys which all seem to have the narrower ridge. perhaps the wider were just a batch before the advent of spun hubs. (i am quitting while I'm ahead having seen all Jan's variations.......).

Here is a photo of the early MT land rover at last.

In case it hasn't uploaded properly which seems to be the ongoing case with this DTCA website, the picture is on flickr.com under OKC 77/Dinky Toy/Land Rover mark 1 Mersey Tunnel police, scouse 73.