You've got the 4wd bit down fine. To engage low there are 2 methods.
1) press yellow, and then pull the red one back (and yellow will pop up)
or 2) just pull the red lever back.
diffs you don't need to do anything to make work, they just do.
Just remember that you can not use 4wd on tarmac as it is true 4wd and will wind up the transmission and at worst, break something. dirt roads and tracks only.
the 4wd puts 50% of the power to the front and rear axles evenly.
a diff lock makes the wheels on both sides of an ale spin at the same speed. good for off roading because if you put a wheel in the air the one on the other side will still keep turning, but it's no good for steering 
1994 Discovery TDi
2004 Discovery 2 TD5
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1961, Series 2 Ambulance. 108-098 - Eden
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