However, in anticipation of this I installed the relevant site certificate at the end of last year so your website is perfectly fine and you need do nothing. You might like to check with friends and colleagues that they are aware of this major change so that they have the opportunity to change before the deadline  What is an SSL Certificate?

How to check if as website is secure

Assuming that your browser does not give you a warning that the site is insecure, you can check by looking at the web site url.

Secure Web Site

Secure or http sites will have a small padlock as well as the https text.
Firefox Browser		Chrome Browser

Unsecure Web Site Examples

Secure or http sites will have a small padlock as well as the https text.
Firefox Browser		Chrome Browser