Haven't finished chapter, but i thought i'd post it anyway.
Donna and the Doctor slowed as they approached the city gates.
"That's strange," the Doctor said, "The gates should be open."
But the great wooden gates were firmly closed, the white paint dirty and peeling, the hinges rusted.
"What does that mean, Doctor?" Donna asked, concerned.
"I'm not sure, one way to find out!" With that the Doctor lifted his hand and banged sharply on the imposing structure three times. Then they stood and waited. And waited. And waited. Donna was about to suggest they go back to the Tardis, when there was a scraping, scuttling sound from behind the gates. A small eye hole, previously hidden in the design, opened in a shower of paint peelings.
"Who's there?" The voice was unpleasant, raspy and dry, but still carried authority.
"Hi," the Doctor peered at the eye hole, trying to make out the owner of the voice "I'm the Doctor and this is Donna, we've come to see the zoo." The Doctor waited for a response.
"Tielaran zoological society no longer accepts tourists." The eye hole snapped shut.
Stunned, the Doctor and Donna listened to the rapidly retreating footsteps.
"Okay, plan B." The Doctor reached inside his coat.
"What's plan B?" Donna looked expectantly at the Doctor, but his only response was to knock once again on the door and continue rifling through his pocket.
"What?"
Donna jumped at the voice and the snap of the opening eye hole.
"No tourists, go home."
"We're not tourists. We're…hang on…" the Doctor triumphantly pulled the psychic paper out of a particularly deep pocket. "We are the health and safety inspectors from the Interplanetary Workers Union, come to inspect the community's…health and safety."
"The 'I triple U'?" The voice sounded surprised. "Haven't seen any o' your lot for many a year. I guess you can come in."
"I triple U?" Donna asked over the sound of bolts being pulled back. "I thought you said 'Interplanetary Workers Union'?"
"I did." The Doctor replied quietly. "They changed the acronym. I mean, could you imagine having to say 'I-double U-U' all the time. It's not very important-sounding is it?"
Donna was about to respond when, with a squeal of rusty hinges, the city gates opened. Standing in the small gap, there was a wizened old man in a blue uniform.
"Come on then." He rasped out, then turned and walked away.
"See, Donna? Plan B."