In the UK if the revenue (HMRC) send you a tax return you have to complete and send it on time irrespective of whether you have a tax liability or not.
There have been numerous news articles about people being sent £1,500 fines and penalties for failing to send a return, when they had no tax liability in the first place! One guy was homeless!
I'm afraid that expats have plenty to worry about, irrespective of what is said in the op piece above.
Perhaps the smartest move for the mobile expat is to live under 180 days in Thailand and the rest of the time in a low tax jurisdiction. For those with families and jobs it is much more difficult.