I Think I've Found P Ps True...
Society & Culture0 min ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.The only time you can travel without a passport is when you are a Citizen of the Common/Free Travel area and within the Common Travel Area, ie Ireland, UK, IoM and CI. In this case you can use a photo driving license or other official photographed id - Uni, id card, government employee id card for eg.
By law you are required to have a full, valid passport for travel to every country if departing from the UK and Ireland. Being in the EU means nothing. The UK and Ireland are not members of the Schengen Agreement. This means the two countries have retained their full border controls.
Therefore, if you leave the UK or Ireland for say the Netherlands by plane you are entering the Schengen Area and you will have your passport checked. Flying on to say Greece from there - Schengen to Schengen you will 99/100 not have any checks. When you return to the UK you will be ckecked at passport control when you leave a Schengen country and will be put under a microscope when you try to go through UK immigration.