From: Jim Carroll
Date: 31 Dec 17 - 05:03 AM
You have the official vesrion Iains and you chose to ignore it
Case closed, I think

I take it that you're referring to your quote in your previous post:

From the EU guide to travellers in Europe
"If you are an EU national , you do not need to show your national ID card or passport when you are travelling from one border-free Schengen EU country to another.
Even if you don't need a passport for border checks within the Schengen area , it is still always highly recommended to take a passport or ID card with you, so you can prove your identity if needed (if stopped by police, boarding a plane, etc.). Schengen EU countries have the possibility of adopting national rules obliging you to hold or carry papers and documents when you are present on their territory."

The section in bold means that your quote has nothing to do with the discussion. Neither UK nor Ireland are part of the Schengen area.