Apart from being hidden under the middle of a vehicle, the land rover drum brake is one of the best drum brakes I've ever come across for work on. If it hasn't recived any atention in a long while, combined with plenty of mud, then its probably a good time to get aquanted with it and give it some TLC.
The first time may take a while to service one, but once you know what you looking at its pretty straight forward, unlike some drum brakes which even with experiance are expletives to work on.