Well all is not lost....thanks to the wonders of www.rangerovers.net
(Thanks Lee_D!) I found this link
http://www.rangerovers.net/repairdetails/airsuspension/faultclearsoftware.html
which details how to make a cable to connect the ODBII port to your
laptop and then run the EASFaults to get the Fault codes, then
EASUnlock to clear and reset the ECU.  So once I'd run both programs I
came into the house to look up what the problems were.  Then I had to
move the P38 because it was blocking the drive, and lo and behold the
car started to rise like the Phoenix from the Flames!!  I've been out
and about in it tonight and all appears to be working OK!  So so far
so good, it just means I'll have to take my laptop with me everywhere
I go incase it faults again!

Just a couple of issues now: the aircon problem to sort, I thought it
was the shim problem but I can't seem to undo the nut without the
front plate turning...but I think it may be the blend motors.  Also I
suspect the O rings are failing, but I've had a quote of £80 for a
mobile guy who claims he can replace them in 90 minutes without
drilling or cutting!!  So I'll get him to do both jobs probably..!

Other than that its running lovely, the new engine sounds so quiet
until it comes into action, then it just sounds glorious!

--
Paul

Thanks for sharing the details I have archived them for reference should
save money in the long run maybe the nice man selling a read/reset tool in
the comics might like to review his £175 price tag . Now if we can get the
engine management software we are halfway home  and I am a step nearer to a
P38 DSE
Derek
Disco 300Tdi 'Miles'
Disco 200Tdi 'Kato'

Well all is not lost....thanks to the wonders of www.rangerovers.net
(Thanks Lee_D!) I found this link
http://www.rangerovers.net/repairdetails/airsuspension/faultclearsoftware.html

<snip>

Nice one!