Hence, anyone using cable with the new colours could genuinely have
finished the work ahead of Part P being introduced. So,looking
ahead,the use of the new colours cannot be deemed by the "authorities"
as evidence of work having been done after Part P came into force.

Indeed the guv'mint cocked up. Hence new colours become available and legal
before Part P was implemented and so cable colour is unable to be used as
proof that work should have been done under the new regulations.

Christian.