Your EHIC lets you get state healthcare at a reduced cost when abroad. It is not, however, an alternative to insurance and insurance must be purchased prior to traveling with Wasteland. There is the option to purchase insurance via your account on the booking page www.web-based-bookings.com. To apply for an EHIC card, please visit the NHS website.
At this current time, EHIC cards are still valid and are expected to still be valid for a period of time after BREXIT in March of 2019, we do however recommend checking the status of EHIC cards prior to your departure.