It is alleged, that the union on a TD4 can be undone with a pair of pointy nosed pliers, carefully inserted into the small groove at one end of the union, and used to lever the fitting apart.
LR manufacture a special tool to do this, and many specialists (such as Cheviot 4x4) have manufactured special tools to do this much cheaper. Unfortunately, using pliers will usually damage the fitting.
2010 Freelander 2 TD4_e GS
2013 Peugeot 207 Hdi
Labrador & Miniature Poodle.
Once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return. - Leonardo Da Vinci