It takes an average of 6 weeks to get an invitation.
I think it could be right place right time....sent mine second time round via dhl, so tracked it all the way to somebody in HR who signed for it and recieved a good email 8 days later! This was for a december invite. Could be they make the decisions at a certain time in the month. Did send a app via Royal Mail but I think it is still stuck in Manchester! 8 weeks later....gotta love the UK's mail system!
Onward to the interview and cheers for all the info!