2nd POST, many thanks for the reply on the 1st

Just purchased my X5 3.0D 2002 and loving it.
I was getting a error on my dash regarding the washer tank and when filling up noticed that there was water escaping. On closer insepction on the 7.8L tank, to your right was where the leak was coming from. It seems that a hose is missing for the headlight washers as the rear and front washers are working fine.
I have looked in the engine and cannot see the hose, are these hard to replace? I have looked at a few threads but cannot find information on this. Can someone please direct me?
Many thanks