BBC Chinese, Mar 4, 2011.
http://www.bbc.co.uk/ukchina/simp/uk_life/2011/03/110304_life_counterfeit_money.shtml
, which is translated from
Michelle Martin, How much forged money is in circulation in the UK? BBC, Feb 28, 2011.
http://www.bbc.co.uk/news/business-12578952
Note:
(a) The article says, "但是，参观一下为英国 [及] 其他150个国家制造纸币的法国制币公司（De La Rue），你就会发现还有很多其它隐蔽的防伪方法."
De La Rue is English, not French.
http://en.wikipedia.org/wiki/De_La_Rue
(Headquarters Basingstoke, Hampshire; The Company was founded by Thomas de la Rue who moved to London in 1821 and set up in business as a stationer and printer; in 1855 it started printing postage stamps and in 1860 it began printing banknotes/ De La Rue sells high-security paper and printing technology for over 150 national currencies [and] claim to be the largest such corporation in the world)
(b) Coins of the pound sterling
http://en.wikipedia.org/wiki/Coins_of_the_pound_sterling
(since the introduction of the two pound coin in 1998, ranges in value from one penny to two pounds--1p, 2p, 5p, 10p, 20p, 50p, £1 and £2; The English penny first appeared in Anglo-Saxon times [886 AD], as a [hand-hammered] silver coin)
* Decimal Day
http://en.wikipedia.org/wiki/Decimal_Day
(Feb 15, 1971; section 1.1 Old system)
(c) Banknotes of the pound sterling
http://en.wikipedia.org/wiki/Banknotes_of_the_pound_sterling
(The bank issued its first banknotes in 1694, although before 1745 they were written for irregular amounts, rather than predefined multiples of a pound)
Section 5 England and Wales
5.1 Bank of England notes
5.1.1 Current issue: 5-, 10-, 20-, and 50-pound notes