In case anyone wonders, the host for both the ComboGib London and NW London servers is having connectivity issues. They are currently investigating the issue.
For ComboGib you can play on the ComboGib London 2 or Atlanta servers as an alternative.
I will update the thread when more information is available.
Edit: A few players have joined Combo Atlanta, it seems not many know about London 2 yet.
Update: They have identified the cause and are working on a fix.