if the government had failed to implement a directive by the deadline (is that the case in this case?)
That perhaps wasn't quite the case in this instance Jonathan. The 2002/24/EC Type Approval law was implemented correctly right on the six months deadline on 10th November 2003, that law having been issued to all member governments on 9th May 2003.
The error was in not dealing with the conflict arising from the 250 watt pedelec exemption. However, that motor vehicle law only exempted a pedelec from type approval, it didn't exempt one from the UK EAPC power limit law, this being 200 watts. If a senior court went deeply into the issue, they could discover that the error was not in a failure to amend the EAPC regulations for the following reason:
2002/24/EC was accompanied by instructions that member states had the six months to propose any alteration for consideration by the EU commission. Had the DfT studied the order at the outset, they could have proposed an amendment to include provision for the UK 200 watt limit law in the pedelec exemption which no doubt would have been accepted since it had no safety implications.
So the DfT could be accused of that neglect, but it could not be convincingly said that they should have changed the EAPC law to 250 watts at that time since there was that offered alternative. That would probably still leave the prosecution for having a 250 watt machine valid.
As we found at the time of an intended prosecution, the possibility of embarrassment for the DfT and police was the most effective way of stopping that attempt. Dropping the matter was by far the easiest way of avoiding problems.
.