In an ideal world the revision will remove the necessity for any further action and no-one will be necessary!
If they really wanted to save themselves from ever having to bother with this topic again, then they should look to future-proof any revision to the current laws.
At least part of the problem with the EAPC regulation is the reference to the need to define the motor power output to BS1727:1971, something that may be beyond the means of many smaller vendors and certainly beyond the means of individuals who fit a kit to their bikes.
Add in that this BS has been long since superseded, so that no BS approved test house will be currently equipped to test a motor using it without, perhaps, an expensive amendment to their accreditation, and it becomes obvious that this statute has outlived its usefulness.
If the revision included acceptance of the EU regulations and also acceptance of any electrically powered bike that met these three safety related critieria:
1) Weighed less than 40kg (solo, or 60kg tandem or tricycle)
2) Had a maximum power assisted speed of 15.5mph
3) Complied with the Pedal Cycles (Safety) Regulations 2003 or any law that supersedes this in future
then they could save an awful lot of angst and hassle.