https://www.mumsnet.com/talk/_chat/5284014-what-to-do-in-ae-if-i-cant-sit-and-wait-what-would-you-do?reply=142676194 example of one that broke.
If I paste in https://www.nhs.uk/conditions/supraventricular-tachycardia-svt/ then it looks OK but if you click it, it tries to go to conditions/supraventricular-tachycardia-svt/ and you have to edit the post to fix the link target.
In programmerese for your tech team, the <a> element's href attribute is losing the hostname part of the URL for nhs.uk links.