But it always used to start at Red for any complete new edition of the regs, starting the 18th on Blue was unusual....
Was that just coincidence because the 15th and 16th did go though the full 5 colours on their own,
but the 17th didn't..?? e.g.
15th: 1981 Red, 1983 Green, 1984 Yellow, 1986 Blue, 1987 Brown..
16th: 1991 Red, 1994 Green, 1997 Yellow, 2001 Blue, 2004 Brown..
17th: 2008 Red, 2011 Green, 2015 Yellow..
18th: 2018 Blue, 2022 Brown..
So the colour sequence is consistent.. (for 40+ years)....
But until the 18th, there hadn't been a previous edition that didn't use the full five colours.
as for the book colour goes, does it not follow a pattern RED, Green ,Yellow, Blue, Brown
as the 17th stopped on yellow then the next book would be blue, so we are now on Brown so the next should be Red
That is as I understood it.
And as we have now only gone through the colour sequence three times, patterns can be a bit vague?..