Platinum challenge success
They finally posted the miles from my return flights and I have become platinum. Complete with 100% bonus for my last flight and all.
I am very happy that this became a successfull double challenge as I received a few extra miles in the way of the 25% Gold bonus for the flights I made between reaching gold and platinum, which works out to 2195 miles extra. I was also able to use some of the gold member benefits such as electronic upgrades.
What this does mean is that it may be possible for you to first sign up for the gold challenge, then wait a couple of days to do the platinum challenge. Write here if you manage to do so.