(cf 2008 Reg cl 122)
If this Regulation is amended so as to impose a new condition on a driver
licence (whether or not of a particular class) or to amend an existing
condition applying to such a licence--
(a) the new condition or amended condition applies to all such licences, regardless of when they were issued, unless this Regulation expressly or by necessary implication provides otherwise, and
(b) the new condition or amended condition applies only in respect of conduct occurring after the new condition or amendment to the condition takes effect.