Julian how do you know about if you don't hear back by 6 weeks it means it's over?
Because of my experience in job research and my knowledge of computer systems. The most I had was for Microsoft. They called me 1 month later and I was very surprised.
Human Resource staff does not check every applications. They have a software that displays what profiles fit more or less well. Of course the best ones are at the top of the list.
But...hey, maybe I'm wrong ! Maybe it is different for this kind of opportunity.