Domestic

Presuming Martha came home 12 months late, and Tom did the same investigations Mickey did, here's what happened next.

Martha stood in the kitchen with Tom, Francine, Tish and Leo, where Tom was threatening to tell everyone about the Doctor.

"Well it doesn't matter, coz the Doctor's gone," he told her.

"What?" stammered Martha. "But he can't have…" From behind them, the door opened to reveal Clive, with Annalise at his arm.

"Is it true?" he was asking people. "Is Martha back?" Suddenly he caught a glimpse of her as she ran out the door.

"Martha!" he exclaimed, running after her.

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Outside, everyone stood by the spot where the TARDIS had been just a few minutes ago.

"But he can't have left, he promised me!" exclaimed Martha. Just then, she heard the sound of the TARDIS engines approaching.

"Oh God," she said. "Everyone go back inside. Mum, Tish, Leo…" Clive and Annalise finally caught up with them.

"Martha…" began Clive.

"Dad, go away," pleaded Martha. "Come on, everyone just go…" Martha put her head in her hands as the TARDIS materialised right in front of them. She quickly ran inside, where she saw the Doctor looking at the scanner screen.

"Alright, so I lied!" he said. "I went and had a look, but the whole crash landing's a fake – I thought so, it's just too perfect. I mean, hitting Big Ben, come on, so I thought let's go and have a look…"

"My mum's here," said Martha. From the door Francine was looking around, bewildered.

"Oh great, that's just what I need," said the Doctor sarcastically. "Don't you dare make this place domestic." This was followed by Tish, who took two steps inside before fainting.

"And my sister," added Martha. Leo came in next, his eyes widening at the sight of the ship. "And my brother."

"Come on Annalise," said Clive, dragging his girlfriend inside.

"And my father," continued Martha as they entered. "And his girlfriend." Annalise promptly screamed. The Doctor gave an exasperated sigh.

"You see what I mean? Domestic," he said.

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Just changed this on a very good point raised by doctor-who-mad-gal. I was having doubts about letting Martha have a key, then let her have it, but then changed it.