Just thought I'd post for information really.
My wife was pretty disheartened when we got to the end of the application yesterday and the only option presented was the standard service with upto 6 months processing time.
I told her we would hold off for a week and I'd keep checking and see if at some point a Super Priority option would reappear.
As I was up early for work this morning (0430 AM) I logged in and the option was back.
So if at first the option isn't there its worth possibly holding off a day or two and checking to see if they release more Super Priority slots.
Hope some people find this useful!
Al