Clive D. W. Feather wrote:
In article ,
Colin McKenzie writes
E onwards ran from Aug-Jul
making D a short "year"?
More or less, but E was the short year, and the changeover in 67.

Wasn't there a later change to October, then to September?

The S prefix ran from August 1998 to February 1999. Thereafter, prefix
letters T,V,W,X and Y were each valid for 6 months starting on 1st March
or 1st September. These are also the starting dates for the date numbers
in the new format used since September 2001.
--
Richard J.
(to e-mail me, swap uk and yon in address)