Xantia II; knowing whether it's necessary to flush LHM

[Xaccers]

The BoL covers it quite well
Set car on low, let it settle, open bleed screw. Engine off, steer full left and right.
Remove the two 10mm nuts at the back of the tank.
Pop out the pipe/filter unit, I use a clean 2lt coke bottle with it's top cut off to protect the unit.
Move the air filter box out the way so you can see under the tank, use a pry bar or long flat screwdriver to pop the peg, that sticks out the bottom of the tank out of it's hole, and remove the tank.
Pour the contents into a container, preferably through a strainer incase the anti-floatbob disc has fallen out of the filter unit.
Rinse tank with petrol and allow to dry.
Clean filters with petrol and a soft cheap toothbrush, not one with rubber in the head.
Refit is reversal of removal.
Fill with hydroflush, bleed the brakes until they run clear.
Drive for 500-1000 miles and repeat using fresh LHM.