Well my implant is in (yesterday) and I'm back home again, so I guess the journey has well and truly started now.

Ended up having the device implanted just behind my left armpit. Not quite where I expected, but the two docs had a discussion and mapped out where they thought it would fit best. So far so good, except for on the trip home when Rae drove around a couple of roundabouts that I wasn't prepared for. Still it is very early days and everything is swollen a bit and sore from the procedure.
Thanks for everyone's help and advice and more importantly your support.
Phil