Thanks for that , T 5 South is the go , so that is where I will be heading . Cheers .

Yes , you are probably right ..I have done this trip for several years , but this is the first time I have had such a long transit . Looks like it is a BA lounge at T5 for me . Next question ....which lounge is best ? ( north or south )

I am flying Qantas J Syd to Heathrow . I have a 7 hour wait until connecting BA Clubworld to Toulouse . Can I hang out in a T3 lounge ( Emirates ? ) , or BA at T 5 . What is the best lounge ?