Raddish

Hi, I've had my 1998 Xantia 2.1TD Exclusive off the road since mid Jan, and started it up yesterday to replace an ABS sensor on a rear wheel. I put the suspension to it's highest setting, and waited til it had risen, then turned the engine off and got down to put the jack underneath. This is when I noticed a puddle of LHM on the ground under the engine bay... I started the engine up again to see if I could see any dripping with the engine running, and when I looked, LHM was pouring out from the engine bay above the passenger side wheel, and dripping down all the steering linkages. Is this as serious as it seems? Does anyone have a clue what might be causing this? I have noticed a distinctive green LHM puddle on top of the reservoir...