Not necessarily a HUKD, its more of an European entitlement.
Not to be used to replace Travel Insurance
'If you are a UK resident, you are entitled to medical treatment that becomes necessary, at reduced cost or sometimes free, when temporarily visiting a European Union (EU) country, Iceland, Liechtenstein, Norway or Switzerland. Only treatment provided under the state scheme is covered. However, to obtain treatment you will need to take a European Health Insurance Card (EHIC) with you. Please note: Not all UK residents are covered in Denmark, Iceland, Liechtenstein, Norway or Switzerland. Click on the 'Access to Healthcare Abroad' link below, if you are unsure whether you are covered.'