Welcome from the UK. Looks like you have a fairly early example of a standard Series 2 Land Rover. For info it would most likely not have an overflow...
The international Identifier UK plate goes on the rear of the vehicle. Technically I believe it should be illuminated at night but usually a sticker...
Thanks for the input, gentlemen. In answer to you, jmrr, yes the PTO shaft runs off the transfer case. Pic attached. And, yep, above the crossmember....