With Google now flagging plain http websites as not secure the time had obviously arrived to purchase and install a security certificate for the website. This was, by the way, a deliberate move by Google to force the issue on the multitude of websites that had not yet made the move.
All URLs on the website now begin with https and you will also see a little padlock in the address bar that indicates that the site is secure, and that all transactions with the website are now encrypted in transit.
If you have bookmarks for specific pages please update them. The page will automatically be redirected but that takes a little more time. Please also ensure when passing on links to others that you use the https version.
Antony Gordon (Webmaster)