If you have an open support ticket with us, the easiest way to reply is by email — just reply directly to the notification email you received (don't start a new email), and your reply will be added straight to your existing ticket.
Can I just email support@informdirect.co.uk instead? You can, but starting a brand-new email rather than replying to the notification will usually create a new ticket rather than adding to your existing one — so it's best to reply to the notification thread if you want to keep everything on the same ticket.