I have the offer at $399 and was considering a F trip one way from MLE-DXB-LHR for myself and 1 other passanger on the same booking. From what I read I should be able to get the discount of 20% of the miles, 49k.

The issue I see is it suggests I must use the desktop site to make the booking, which if I want to fly from MLE-DXB one day and then from DXB-LHR the next the site doesn't allow me to do it and assuming if I call to book I wont get the discount. I wondered if I booked it with the same day flight and then tried to change the DXB-LHR flight to the next day within the booking this may get round the issue, has anyone tried this or think of any reason it shouldn't work?