Updated : 10/07/2017
For the time being, the United Kingdom remains a full member of the EU and rights and obligations continue to fully apply in and to the UK:
In addition to their own valid passport or ID card, all children travelling:
may need an extra (official) document signed by their parents, second parent or legal guardian(s) authorising them to travel.
There are no EU rules on this matter, each EU country decides whether or not it requires such documents. Check, before the child travels, the requirements of the country you are travelling both from and to:Choose country
* Information not yet provided by national authorities
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Bear in mind that, even where a country does not require minors to carry such an authorisation to leave or enter its territory, other countries they transit through may still ask them to show one.
When travelling by air it is highly recommended that you check with the airlines beforehand as many require such authorisations and have their own specific forms for this purpose.
As each country's rules may change without notice you are also encouraged to check with the authorities themselves or with the respective embassies or consulates.
See also: Taking children abroad legally