Question: When did the £20 note come out?
Disambiguated questions and answers: question: When did series F of the £20 note come out?
When did the series E variant of the £20 note come out?
When did series E of the £20 note come out?
answer: 13 March 2007
22 June 1999
5 June 1991
Natural Questions answer: 1725 (from the Wikipedia article "Bank of England £20 note")