Somewhere in the documentation received they inform you not to call them, so I would just sit tight and wait for your Interview notification. Dont worry too much if you dont hear from them for upto 6months, thats how long it took us to hear back from them last year. We also only had 1 month before our interview from the date we received the notification. Be sure that all the documentation you can get together you do get it together and is in order. Cross-check your passport now that you have more than 6months validity remaining, say if your interview was in 5-6months from now. Those are one of the things that you might ignore and they catch you out.
Good luck
Wendogg