Paul, this is what is listed agains that code in the workshop manual:

That's brilliant thanks. Probably consistent with maybe some less than waterproof wiring round that area as at the time the light came on there was lots of standing water around, we even had to drive through around a foot of water right across the road in a village near home.
Will do some investigating next week when I've finished my current run of 12hr shifts!
Think you are right about the manual - those fault codes are so damned specific!
Paul.