Hi!
> And yes, I've been on expensive mobile broadband when traveling lately > and am a bit afraid of getting expensive bills in a few weeks... I'm sorry for that, this bug tracks fixing this exact issue.
As stated in earlier message https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=890381#39, this issue is to some degree addressed in u-u ver. 1.4 with commit https://github.com/mvo5/unattended-upgrades/commit/e4d0f0bb17 The commit message mentions that the commit fixes https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=855570 which is now closed. Maybe #890381 could/should be closed too. Kamil