If you do, please read on. If you have one issued by your host country, this does not impact you.
Under new NHSBSA guidelines that have just come out, you need to renew your UK issued EHIC, as your current card can only be used up to 31 December 2020. This is good news as the new EHICs will verify that you have continued rights to use them under the WA.
You can make your application online - if you currently have a UK issued S1 it's a very quick and straightforward process. you need to tick the box that says you have an S1, give your name, your address, your date of birth, a phone number (optional) and your email address. You'll get an acknowledgement that you've completed your application, and an application number. You will receive an email acknowledging your application and then - presumably - your new EHIC-E.
Here's the link - just follow the simple instructions. It will take you quite literally 2 minutes.
(This only applies to UK issued EHICs - if you have an EHIC issued by your host country it doesn't apply to you).
Please share this important information as widely as you can. Thank you!