Finally got my install properly sorted and it works great. The only slightly strange behaviour is that if you select "disc 1" to give full controll to the Ipod, the display reverts to "Disc 1, Track 1" everytime you switch on.
What this means is that if you start listening to some tracks and get up to, say, "Disc 1 Track 8", then switch the Symphony off for any reason, when you next switch on it will recommence play back from where it left off, but will now call this "Disc 1 Track 1". Can be a little confusing, but no great problem.
I have put the Ipod in the armrest with the cable routed through the centre console:
Very pleased so far - now I've just got to reclaim the space in the glove box.
Cliff