We have to remember that the Integrity is the GPS weak point, and therefore it cannot be certified sole mean....
Nevertheless, it has been in the past...ten years ago to be specific, for some installations, for enroute guideance.
I suspect our UK/European friends just simply don't like the GPS idea, due to the 'not invented here' syndrome.
And yet...they will use one to find the nearest Italian restaurant in a strange town where they have never been before...
Go figure.
