You can "bank" on it. That's why I fly Emirates. They allow you 30kgs per bag and on transatlantic flights you're allowed 2 pcs of checked baggage.

Don't know about out of UK - Qatar Airways says they only allow 2 checked bags on transatlantic flights, I flew with them (for the last time ever) to Vietnam/Cambodia/Laos - the flight back to Qatar is 8 hours (direct no stops) - it doesn't take that long to fly to Canada from London, yet I was only allowed 1 pc 20kgs. Go figure.

I will NEVER EVER fly with Qatar Airways again. I welcome the stopover at DXB if only to have a decent airport and facilities to wait in.