I have seen such emails too, but also got the opposite response from the local Plod here.
I agree that with such an email in your hand they can’t touch you, because there is no overriding regulation, and even if there was, in the UK, you are entitled to rely on “apparently official” advice even if it is legally wrong.
However, you can also travel to the UK with “aeronautical specialist” exemption on the PLF and avoid the Day 2 testing etc and nobody will care because while the police see if you filed the PLF or not, nobody reads the PLF content 
The issue with crew exemptions is that they are written in fairly generic terms. The Irish legislation says something along the lines of “the crew of an aircraft arriving in the state in the course of their duties”. What matters in the end is not that the police or the public health authorities think, but rather what a judge thinks. But none of this has been tested in court yet so we don’t really know what a judge will think.
You’re then left with the choice of whether you want to take the risk that the authorities think you aren’t allowed and decide to prosecute and you have to go to the expense and time and hassle to defend yourself, risking a criminal conviction, or you’re prefer to comply with restrictions that might not actually apply to you.
But at this stage, most of the restrictions are gone and I think in a few more weeks, even fewer will be around.
To enter Ireland, the only restriction at present, is the completion of a passenger location form, which is 2 minutes on a website before you come. Not really worth taking a risk to avoid.
dublinpilot wrote:
but rather what a judge thinks
What matters is what other private/amateur GA pilots think (mostly on Forums & FB), I doubt the judges are interested in clarifying those bits
I recall last year for commercial crew, they had mandatory PCR tests before unions started complaining and exemptions appeared in airliners procedures, still nothing in French law about ‘crew test exemption’ but it’s understood to be the case !
It’s interesting that UK, Switzerland, RoI…have legal texts, in other places there is maybe NOTAM or Nothing
dublinpilot wrote:
To enter Ireland, the only restriction at present, is the completion of a passenger location form, which is 2 minutes on a website before you come.
You need to be vaccinated too, no? At least you did when I came over last year.
Seems like we have good news regarding traveling:
https://www.consilium.europa.eu/en/infographics/covid19-travel-measures-eu-january-2022/
That is good but probably going to be only within the EU.
That is good but probably going to be only within the EU.
It can be extended to countries with bilateral agreements to EU countries.
That would be Norway and Switzerland but definitely not the UK 
But the LFT test is just £20 and you can get a certificate by email (it’s an unsupervised test) within a few hours, max. It’s a total no-brainer now. Just buy a few LFT kits so you always have one ready.
Come to Jersey on 7th February. We will be pleased to see you! This is the world how it should be. If 10 years ago you were told that it was a good idea to upload all of your details to some centralised bureaucracy (the EU) so they could allow you to travel and track your movements via a device in your pocket would you have thought it was a good idea? We are all so brain washed it will be the flu vaccine next. Or perhaps they won’t mandate that but give you a few social credits?
For goodness sake- time to move on.
Traveling to Bosnia is like that for 6 months at least, no certificate of any kind asked, no PLF forms, nothing. Vaccination level low, 50 deaths daily, few thousands infected every day… There are different approaches to handle this situation.
