After a quick ELIT and Lexia diagnosis, a spare diode "fix it"kit was sourced from Jim's boot
Also discovered was that the plug for the rear hydroactive diode valve thingy was unplugged. Back at Jim's this was replugged in and hey presto the system sprang back into life 8)
On the way home on the M1 every time i went over a big undulation in the road a smile came on my face as the car blancmanged its way through it
I owe you one boys