Had to come on and write a review because I had yet again been utterly staggered by the speed and efficiency of Clook's customer service. As follows: At 13:14, I opened a ticket on the Clook support site asking if they were able to support Let's Encrypt SSL certificates. At 13:16, they replied to say absolutely, they could add it to my reseller account and it would then be active for all domains I add, should they go ahead? At 13:21 (I was doing the dishes) I replied to say that that would be great At 13:23 they replied to say it was now enabled. I tested the site and it was already on HTTPS. Never seen anything like it. If you are in any doubt about signing up with Clook, trust me and do it :)