Upstairs (audio story)

After seeing seven chair legs in the attic, Vicki wonders if there were wooden androids in Victorian London.
Vicki refers to her former travelling companions Ian Chesterton and Barbara Wright.
10 Downing Street was badly built on shallow foundations by a crooked speculator, Sir George Downing, in the 1680s.
The Doctor tells Steven and Vicki that William Pitt the Younger, the Prime Minister of the United Kingdom, died at the age of 46 in the early 19th century while Steven reads that another Prime Minister, George Canning, died in office in 1827.
That morning, Steven ate bacon and eggs from the TARDIS' food machine.
The food machine rearranges molecular deconstructed fungus into whatever delicacy was ordered.
Lord Salisbury was the Prime Minister in July 1900. He allowed his nephew Arthur Balfour to use 10 Downing Street.
The Doctor knows a Comanche war-cry.
The Doctor tells Mr Bartholomew that "Lord Steven" is a member of the Marylebone Cricket Club.
The Doctor tells Steven and Vicki that every empire in the history of the galaxy has eventually collapsed.

Notes

Vicki recalls being rescued from Dido in 2493 by the Doctor, Ian and Barbara. (TV: The Rescue)
During his ninth incarnation, the Doctor once again visited 10 Downing Street in September 2006. (TV: Aliens of London)