So what are the limitations of ministers deciding on a whim to change the law, could they ?
Increase the legal speed limit of a pedelec ?
Increase the power limit of a pedelec ?
Permit parties in lockdown in 10 Downing street ?
Obviously not the latter. Ministerial orders permitting ignoring laws in prescribed circumances are usually long preceded by well understood and discussed circumstances, OR to deal with exceptional circumstances. It is only that last one we should worry about.
Take the three examples I posted:
1) the year 2000 permission to cycle on pavements when in fear of traffic: As I've already observed, cyclists were first given permission to ride of pavements when shared footpaths were introduced 20 years earlier, so that and the desirability was already a much discussed and understood subject.
2) the year 2013 permission to regularise the 250 watts in place of the British law's 200 by ordering the police to accept the variation in watts: This was already the law anyway, but that only seemed to be known to me and our courts, since the DfT and the police were blind to the facts. Basically the ministerial order was unnecessary, only covering the DfT's own error 10 years earlier. In addition, the DfT had held a public consultation in 2010 and reported on its conclusions in 2012, so the interested public had every opportunity to be aware years in advance.
3) the 2019 order that an EAPC could through type approval have a fully acting thottle and be still treated as a bicycle for all purposes: Ths again had been dealt with by the public consultation and response of 2010/2012, which had revealed a widespread desire for such a measure. So that misterial order was answering a public desire.
So you can see there's little to be feared from such adjustment orders.
The ones we should watch are the so called exceptional circumstance ones, like those for Covid. For example Matt Hancock's ridiculously excessive fines imposed on a whim were grossly abusive, breached existing parliamentary law, encouraged police to abuse their powers, were not only ineffective but actually promoted widespread disobedience of the Covid regulations, spreading the disease much further.
.