Someone will probably give you a better reply, but they were used in situations where four wheel drive was considered unnecessary. So the Ministry of Works had quite a number for works vehicles associated with historic buildings. The forces used them on airfields, for recruiting, in Germany (BAOR) and Military Police amongst other things. They weren't as useful as had been thought and the Ministry of works ones were sold off fairly quickly I think. The majority have or had *** FUV registrations. The army continued with a small number in the later series, but the Dutch had a large number of Lightweights in a diesel / 4x2 specification, which caught out some Belgian friends who thought they were buying a 4x4.
If you are able to accept that a 4x2 doesn't do serious off-roading then you don't have to worry about engaging your freewheel hubs every few hundred miles. They're often in good condition. The best reason to buy it would be to stop someone else changing the front axle to make it 4x4.