On 18/10/2019 10:05, Robin wrote:
I only have the 2003 edition:

"11.5 Line and neutral terminals in fixed socket-outlets shall permit
the connection, without special preparation, of one, two or three 2.5
mm2 solid or stranded or of one or two 4 mm2 stranded conductors.

I'm assuming that folding the end over counts as "special preparation"
which would imply that there should never be any need to fold the ends.