Articulated buses in London
Background

Route
Commenced
Ceased
Operator
Replaced by
12
6 November 2004
4 November 2011
London Central
double decker buses
18
15 November 2003
12 November 2010
First London
double decker buses
25
26 June 2004
24 June 2011
East London
double decker buses
29
14 January 2006
25 November 2011
Arriva London
double decker buses
38
29 October 2005
13 November 2009
Arriva London
double decker buses
73
4 September 2004
2 September 2011
Arriva London
double decker buses
149
24 April 2004
15 October 2010
Arriva London
double decker buses
207
9 April 2005
9 December 2011
First London
double decker buses
436
8 February 2003
18 November 2011
London Central
double decker buses
453
15 March 2003
23 September 2011
Selkent London General (1)
double decker buses
507
5 June 2002
24 July 2009
London General
single decker buses
521
5 June 2002
31 August 2009
London General
single decker buses

Question: Which articulated vehicles in London were the first to be replaced?
Answer: The first articulated vehicles to be replaced were 507 and 521, which were replaced by single-deck buses in 2009.