A Mini Metro was a type of car from 20th century Earth. After the Eighth Doctor's Volkswagen Beetle was destroyed, he replaced it with an S-Reg Mini Metro. It had a Volkswagen "VW" badge glued to its bonnet. He parked it in a corner of his TARDIS console room. One of his companions had left a note on its windscreen reading, "It's just not the same, Doctor. Get rid of it." Sarah Jane Smith, who had managed to get into the Doctor's TARDIS while he was imprisoned, found the Mini Metro and used it to drive around the TARDIS' corridors. (PROSE: Interference - Book Two)