This is what I have found - from the horse's mouth.
As I once fell foul of the same people I know what they are like to deal with.
As the work is beyond low water mark, it is taking place in an area owned by the Crown Estate, albeit that the structure of the pier is owned by Six Piers Ltd (Trevor Hemmings)
Apparently when Conwy were intending to do the work they obtained a licence from the Crown Estate and when they passed the responsibility and funding to Six Piers to complete the work, it came with assurance that all permits and consents were up to date and "in ticket"
MP Marine made a good start and then up comes the nice man in the grey suit and says "Excuse Me - can I see your papers please - oh dear - Those are out of date. You will need to re-apply and you must stop work now"
The result will be at least a month's delay and probably six weeks, men laid off, tourists, not least me disappointed - I had promised my grandsons that as I experienced decades ago that grandad would take them a sail to Puffin Island from Llandudno this year - what price that now?
It really makes you spit and shows everything that is wrong with this country. The works had been consented - a thinking sentient human being could have issued an extension - but we are talking of the bureaucrats bureacrat here.
You want to complain - The address is H M Queen, Buck House! or who's the other guy - err the prince of "Wales"?