Just incase anyone stumbles across this post looking at a similar problem it's now resolved. It was just the length of the VGA extension lead. I had tried pretty much everything, put extra ferite rings on tried to make my own cables, with a 3m lead plus the Lilliput lead I was running to 4m. Tried a 2m extension lead and all is fine no ghosting. Just run the cable through a different route so it was long enough....happy days!
Thanks for everyones input!