Update
 

Just to update,
Sent the ICM to Lukasz at Volvodiagnostic. Not the ICM so I've ordered a MOST loop cable from Amazon (£10 for female loop cable).
Lukasz suggested this to fault test the various modules one by one as the ICM is working fine.
He also had a YouTube link you can find called 'MOST Ring break test' there are two parts. Brief but useful.

VIDA shows the same
You should use VIDA now to diagnose the problem, much faster in the long run

Who was it that offered a good 3rd party VIDAS on the forums?

About time I got my own up and running.

....and the DICE of course.

I have used lukasz and was most helpful with advice over the phone
Eventually managed to take car and lukasz fixed problem in a
Very short time highly recommend and very reasonable price

Cheshired sells them, pre tested.

Yeah, CheshireD5 - his post is in the P2 V70 sales section - here https://www.volvoforums.org.uk/showthread.php?t=253191

Thanks for the reminder guys.