Have you met Miss Jones?
Disclaimer: The BBC owns 'Doctor Who', not me.
She remembers the first time she met him. The man who would be Prime Minister.
"Harold Saxon." He introduces himself to her.
"Martha Jones."
She let him take her hand and lead her around the room, introducing her to everyone. She'd ended up invited here by accident. Her flatmate had needed someone to go with to some fancy do in the middle of London and Martha, needing a break from her studies, had agreed to go.
"Excuse me, have you met Miss Jones?"
She had always wondered why The Master took such an interest in her. After the first incident on the Valiant, she realized why. He'd known all along who she was. Martha Jones, The Doctor's time-travelling companion, and a nearly-Doctor herself.