This web site is written in PHP and we are in the process of preparing to upgrade from PHP5 to PHP7 and to move the site to a new server. As part of that we have had to make small changes to a lot of scripts to ensure they are PHP7 compatible. We've been beta testing this on other sites we run but today we have put it live on this site. So if you see anything odd then please let us know ASAP, either here or via our contact page. Thanks.