Well, BA took 10 days to find our bag (which for once I didn't put a secondary label on as I normally would and the Aer Lingus label at SNN seems to have come off) but they DID find it! Well done BA in my book.
I am ashamed to say I saw a bag at YYZ with A4-size contact details sellotaped on and thought it looked a bit geeky. Fifteen minutes later I thought it was a bloody good idea!