BAGOLD, you raise another reason to forego the T4 BA Arrivals Lounge: Even oneworld Emeralds cannot get in unless they've flown F or J on BA or Qantas. Even though CP is a codeshare/oneworld partner on flights from Canada and uses T4, you can only get into the lounge if your boarding pass has the BA codeshare flight number (and of course you flew J), but not if it has the CP number on it.
There is a definite no guests policy on the Arrivals Lounge, even for BA and QF elites.
So if it is a shower you're after, use the one in the T3 First lounge. Even if they won't let both your guests in, take them to the Executive Lounge, excuse yourself to shower and freshen up, then rejoin them upstairs until flight time.
[This message has been edited by Shareholder (edited 05-08-2000).]