Official code used in UK before 1973 to determinate the sales tax %.
- MT code was the official tax code in UK from 1st January to 30 June 1963.
- KT code was used in between 1 July 1963 and 22 November 1968.
- JT code was used from 23 November 1968 and up to 1 April 1973 when UK government took the VAT tax system into use.
If the tax code is missing, then the LP is pressed after 30 May 1973.