The fitness test isn't hard, as long as you are actually fit and not just someone who likes to think they are. But like Rhys said they are pretty strict with form on the pressups and situps.
As for the guy not getting a response from Nottingham AFCO, I had a call today regarding my interview and the Corporal told me they are in a temporary location at the moment so try emailing them and they should ring you when they're free. You'd think they would redirect the calls but you never know.