Todays update..Couldn't do much till last night as I was working and waiting for the pipe to arrive from Citroen Lorient.
Fitted it last night and got everything together .. I relocated the safety valve out of the way of the crap from the wheel arch and cable tied it to the underneath of the 5 way connector.

Hopefully easier to get at and a lot less rust.
After making sure everything was connected, I started the engine.. toped up the LHM .. only to find another small leak.
It seems that I didn't obey my own rule of replacing all the disturbed pipes.. so now I have a small leak from the bottom of the firewall connector array.. I've ordered a couple of replacement pipes and as these only go to the ABS box, they should be fairly easy to fix. I can't believe just how rusty the pipes at the bottom of the firewall array are compared to the pristine pipes at the top.. It must be the lack of shielding on the inside of the wheel arch.. I must see if I can do something about that .. and doing that may help the Gearbox not to suck water when running through big puddles.