Thanks G SXTY, but when you say "much of the IR will be completely new (e.g. airways, holds, instrument approaches)", did you not see I have an FAA IFR rating?
I know things are quite different in FAA land, but they still use airways, holds and instrument approaches. If you just missed that bit from my post then I apologise. I know the conversion will be hard work but hopefully I learnt something in the US!
Thanks.