Yes, it looks like the teamspeak server which we rent from Vilayer has fallen over (or been pushed). No idea at the moment - for silly procedural reasons I am unable to open a support-ticket with them myself; it has to come from Wilco because he is the main account-holder. However, I am sitting in their own TS customer support channel and hoping to get some attention in due course (it has worked in the past, sometimes)...
Failing that, I have the Skype address of the Vilayer CEO... and I'll give him a nudge in due course if nothing is forthcoming from his frontline staff.
Apologies to all for the inconvenience in the meantime. Sods Law dictates this always happens when admins are offline/asleep/dead/whatever.