I've found this post from 2017 explaining that is not required ireland/travelling-alone-with-stamp-4eu ... t#p1507518
Not sure if this is still the case and I don't understand the quoted pages from the document

Does anyone have the info about this?
ESC
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If you have any issue at the border (and adhere to all other conditions outline there), appeal to it.(h) hold a valid common format residence permit issued by an EEA state (pursuant to Council Regulation (EC) No. 1030/2002) or Switzerland;
This is not entirely correct. Well the UK government is to blame, as their websites are providing conflicting information, but Irish residents cannot come back to Ireland via the UK without a visa. Airlines will deny boarding if they want.meself2 wrote: ↑Mon Mar 07, 2022 1:54 pmI assume you have an IRP, not a GNIB, so you fulfil TWOW 3(h), which isIf you have any issue at the border (and adhere to all other conditions outline there), appeal to it.(h) hold a valid common format residence permit issued by an EEA state (pursuant to Council Regulation (EC) No. 1030/2002) or Switzerland;
I did travel : Ireland -> UK -> Home country 2 or 3 times and apart from talking to airline staff there was no hassle. Which is at it should be.littlerr wrote: ↑Mon Mar 07, 2022 3:00 pmLet me just add to my last comment as I'm no longer able to edit it.
This is not entirely correct. Well the UK government is to blame, as their websites are providing conflicting information, but Irish residents cannot come back to Ireland via the UK without a visa. Airlines will deny boarding if they want.meself2 wrote: ↑Mon Mar 07, 2022 1:54 pmI assume you have an IRP, not a GNIB, so you fulfil TWOW 3(h), which isIf you have any issue at the border (and adhere to all other conditions outline there), appeal to it.(h) hold a valid common format residence permit issued by an EEA state (pursuant to Council Regulation (EC) No. 1030/2002) or Switzerland;
The TWOV's above are typically (1) for eligible temporary visitors (e.g. tourists) to travel between the UK and Ireland, (2) for non-EU residents to travel from Ireland to somewhere else. They are not for non-EU residents like you to travel from somewhere else to Ireland.
The UK government has a 'check if you require a visa' service which is very helpful. It's also used by airlines to determine whether a person can get onto a plane.
For example, if I use Chinese nationality and try to get to Ireland:
https://www.gov.uk/check-uk-visa/y/chin ... of_ireland
It says: 'You must also have an Irish biometric visa (marked ‘BC’ or ‘BC BIVS’ in the ‘Remarks’ section) and an onward flight ticket to the Republic of Ireland.'
If I try to travel to somewhere else:
https://www.gov.uk/check-uk-visa/y/chin ... e_else/yes
It then says TWOV applies.
As I mentioned, I have done it twice myself. It doesn't mean it's right. I did it when I was in college. I certainly wouldn't do it again now that I have studied the legislations.mentalmind wrote: ↑Mon Mar 07, 2022 6:32 pmI did travel : Ireland -> UK -> Home country 2 or 3 times and apart from talking to airline staff there was no hassle. Which is at it should be.
I also did: Home country -> UK -> Ireland and had to deal with UK border police twice. They weren’t aware of this info so after some phone talk/manager came over, I got 24 hour permission for UK, dated September 2019 and January 2020. Apart from waiting for 10 minutes with border police, had no issue. Also, airline staff in home country didn’t know about this treaty so they had to make some calls but eventually I was on the plane.
If (that’s a big if) things didn’t changed, if you are travelling to Ireland and has IRP card you can pass thru UK.
On the website you can check “if I need transit visa” and there are list of exemptions, like having US visa or Canada visa etc. I never had to use that but eventually I was allowed to pass thru UK.
But again, UK border police still treats you like you are doing something illegal. So I would get a visa for 2-4 years and don’t have to deal with the police at all.