Downloaded and installed Splashtop XDisplay (2.99 GBP) on the iPad (Thanks, Tim!) and connected to W7 PC via Splashtop Streamer (free). Works very well - a bit stuttery, but there are 3 other PC's connected to our (family) hub. Here's a photo of the iPod with Plan-G displayed on it, with the main monitor behind showing FSX:
I've also undocked the New View from FSX and moved this onto the iPad - seems fine. I'm working towards an iPad display of the basic instruments leaving the FSX VC or external view on the main monitor. I'll report progress...
I think I've arrived in the 21st Century...