By popular demand (1 person anyway!) I have created a video showing the techniques used in livery editor to create a GWR class 800 (look a like) using the I.C.E. Once created, it can be run on the GWR route in scenario editor, using off the rails mode. Hope it is of use to someone, somewhere! (Please be gentle - I only have limited video creation knowledge!)
This is super. Thanks so much westcastlerail. I am planning to do this myself this weekend now I can see how its done and I'll post my results in this thread.