Do all the passengers need to have an EHIC (the new E111)?
The NHS advises that all travellers to other European countries are registered or have a European Health Insurance Card even if you have taken out travel insurance. All passengers should be registered on the NHS system, which can be done either by phone on 0845 606 2030, at the Post Office or online at the NHS website but travellers do not necessarily need to be in possession of the card to go on the trip.