Henry,
1. We did not have a com failure
2. Don't have the current jepp atlantic with me, but we didn't actually enter Shanwick. My old chart says
"Flights routing via RATSU shall not call Shanwick for the oceanic clearance. Scottish shall issue a clearance...." RATSU is on the border of Reykjavik and Shanwick oceanic, and immediately after crossing RATSU you are in Reykajavik oceanic.
So....is ATC expecting "as filed", even though they do not ever say it, nor do they give further routing? Seems logical, yet I've never seen it in print. A difference from the US.