HC Deb 13 July 1978 vol 953 c793W
Mr. Geoffrey Finsberg

asked the Chancellor of the Exchequer what is the estimated life of a £1 and £5 note, respectively and what was the expectation in 1970 and 1974.

Mr. Denzil Davies

Following is the information:

Average estimated life
1970 months 1974 months 1978 months
£1 11 10¼ 9¼
£5 19½ 20 16[...]