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United States dollar (USD) and British pound (GBP) Year 2018 Exchange Rate History. Source: FCR

Swap Current USD/GBP rate Current GBP/USD rate
Source: free currency rates ( 2015, 2016, 2017, 2018 )

Also available:

Yahoo Finance (Yahoo!) - ( 2013, 2014, 2015, 2016, 2017, 2018)
The European Central Bank (ECB) - ( 2014, 2015, 2016, 2017, 2018)
The Central Bank of the Russian Federation (CBR) - ( 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018)
Bank of China (BOC) - ( 2015, 2016, 2017, 2018)
Swiss National Bank (SNB) - ( 2015, 2016, 2017, 2018)
Reserve Bank of Australia (RBA) - ( 2015, 2016, 2017, 2018)
National Bank of Austria (NBA) - ( 2015, 2016, 2017, 2018)
National Bank of Ukraine (NBU) - ( 2015, 2016, 2017, 2018)
National Bank of the Republic of Belarus (NBRB) - ( 2015, 2016, 2017, 2018)
National Bank of Republic Kazakhstan (NBK) - ( 2015, 2016, 2017, 2018)
Bitcoin charts (Bitcoin charts) - ( 2015, 2016, 2017, 2018)
Blockchain (Blockchain) - ( 2015, 2016, 2017, 2018)
Central Bank of Myanmar (CBM) - ( 2015, 2016, 2017, 2018)
Central Bank of Azerbaijan (CBAR) - ( 2014, 2015, 2016, 2017, 2018)
Bank of Canada (BC) - ( 2015, 2016, 2017, 2018)

USD/GBP (United States dollar/British pound) Jan 2018 (01.2018) exchange rate history

Jan 18
0.724
Jan 17
0.726
Jan 16
0.726
Jan 15
0.731
Jan 14
0.735
Jan 13
0.735
Jan 12
0.739
Jan 11
0.740
Jan 10
0.739
Jan 09
0.738
Jan 08
0.738
Jan 07
0.738
Jan 06
0.738
Jan 05
0.738
Jan 04
0.738
Jan 03
0.738
Jan 02
0.741
Jan 01
0.742

*The graphs and data above are based on latest intra-day rates or daily fixed rates (whichever is available).