The EHIC is free of charge and you can apply or renew a card via the official EHIC online application form. Beware of unofficial websites, which may charge if you apply through them. You can apply online for an EHIC, which is free of charge. You can also apply by phoning the automated service on 0300 3301350, or you can download the EHIC application form (PDF, 122kb) and return it to the NHS Business Services Authority. Your card will normally arrive within seven days if you apply using the official process.
You can find answers to all the frequently asked questions here
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