"Our protection systems kicked in immediately and the attack was contained by 10:40am"
That will be why my website is still down at 15.10 - some containment!
123 Reg Support Tickets are useless - they always wait until the problem is fixed several hours later and then proceed to tell you (cut and paste style) that they just checked your website and it is fine, just like there was nothing wrong in the first place.
I get that this is an unusually large DDoS, but at least be honest to everyone when they claim everything is fixed - it's not and it's still ongoing. Tumbleweed....