Enlightened and Beautiful!
This is as close as the US will ever come. Notice the likeness to GW Bush in the 6th image.
Ah but Isaac Newton can be forgiven for experimenting with alchemy.
On the basis of science as then known, he didn't realise (when he began) that he might be following a dead end.
Wikipedia is very good on recounting the history of British banknotes.
Here's a clipping about the banknote issues of the last 40 years:
|£1||Isaac Newton||9 February 1978||11 March 1988|
|£5||Duke of Wellington||11 November 1971||29 November 1991|
|£10||Florence Nightingale||20 February 1975||20 May 1994|
|£20||William Shakespeare||9 July 1970||19 March 1993|
|£50||Christopher Wren||20 March 1981||20 September 1996|
|£5||George Stephenson||7 June 1990||21 November 2003|
|£10||Charles Dickens||29 April 1992||31 July 2003|
|£20||Michael Faraday||5 June 1991||28 February 2001|
|£50||John Houblon||20 April 1994||in use|
|Series E (Revision)|
|£5||Elizabeth Fry||21 May 2002||in use|
|£10||Charles Darwin||7 November 2000||in use|
|£20||Edward Elgar||22 June 1999||30 June 2010|
|£20||Adam Smith||13 March 2007||in use|
|£50||Matthew Boulton and James Watt||2011||n/a|