Make sure you have the free European Health Insurance Card (EHIC) if you are travelling to a European Union member country – it will ensure that you have easy access to healthcare in that country. Obtain your EHIC from www.ehic.org.uk, by calling 0845 605 0707, or fill in a pack at the Post Office. Remember it is still advisable to buy travel insurance, as the card doesn't cover, for example, emergency repatriation, and not all countries give the level of cover of the NHS.
Please be aware that if you follow the above procedure, the EHIC card is free. Beware of websites which offer to take care of the application for you: they are likely to charge an unnecessary administration fee.