If you are a 6 month SAC, are you able to talk to your 'desk' these days?
No. It was possible from about 9 years ago up until around a year ago but it's changed back again, sergeants and above can contact their desk direct, everyone else has to go through the Chief Clerk.
Is there actually any proper advice on here?
It's been given a couple of times, the OP goes to his boss and / or the Chief Clerk, that's the only way forward.