Question: When did paper pound notes go out of circulation?
Disambiguated questions and answers: question: When did paper 1 pound notes go out of circulation?
When did paper 5 pound notes go out of circulation?
When did paper 10 pound notes go out of circulation?
answer: 11 March 1988
5 May 2017
1 March 2018
Natural Questions answer: 1988 (from the Wikipedia article "Bank of England £1 note")