EHIC – You need this (forget about Brexit that is in the future)
Foreign & Commonwealth Office Travel Advice
Do I Need a Visa?
As people travel to more exotic destinations the answer is very important. If you have a look here you will find some useful information .
Trading Standards – If it goes wrong then they can tell you what your rights are and what you should do and how to do it.
Cautionary Note. Holding a UK Passport does not give automatic rights. If you or your parents were born outside the UK then some countries have different rules.