Air Canada's complaints line in the UK is open for one hour a day. That hour happens to be between 11 and 12. Gosh, what a surprise, it seems to be permanently engaged and ringback doesn't work.
I am losing patience with this.
[ETA: finally got through to the number and have reached someone who can at least take a look from within Air Canada -- rather than filtered through Air France -- to see if they can figure out what has happened to the bags. It's not that I especially mind if we get them back tomorrow, Friday, next week, whatever; what worries me at the moment is that nobody appears to know where they are at all.]