Ah, no wonder my phone wouldn't charge!
It's kind of what I thought. I remember in my Disco it was somehwere under the dash and my local Landy agent were forever complaining that the connector was corroded and the couldn't connect to the EMC and so all my services felt incomplete. But I figured that the connector was corroded becasue the AC had leaked less-than-pure water into the area, which is a common fault with Discovery's I beleive.
Thanks.