Have you tried rebooting the hub?
Also have you looked at Check service status at the top of the page? You can also a run a test on your equipment from there.
If nothing is showing you could also try the Service Status number 0800 561 0061. This often gives details of more local issues down to postcode level.
Thanks for posting and sorry to hear you've been experiencing some slow speeds.
I've not been able to locate any details for you, so I've popped you over a private message for this (purple envelope, top right hand corner)