Hi Lemony,
Im not sure about logins for NATS now. I remember a few years back you could use it but im not to sure if you can now until stage 2 but don't qoute me on it.
When I did my first stage 1 test a few years abck I do recall that I did have to wait several weeks to do it. I don't think SHL run any of the tests now except the online test and therefor it will be down to HR to do them. There seems to be alot of stage 1's atm so I assume that everyone at yours will be waiting for another working week.
I know the anticipation just kills you! The very best of luck to you!!!!