Does the tacho record the fortnightly driving hours in the fixed week or working week?
fixed according to my tacho head
Thanks. I had a check before and thought that can’t be right for one week, but its Sunday today so a new fortnight begins tomorrow. So used to my working week being Sunday - Saturday 
As I’m on a nightshift tonight then it should reset itself at midnight?
00:00 Monday to 23:59 Sunday
m1cks:
00:00 Monday to 23:59 Sunday
UTC time… so you may be an hour different to local time… ( just another little trick to catch us out )
UTC TIME ONE HOUR BEHIND! 
if you’re driving at 01:00 hrs flick it down to reveal your fortnightly say 87:45 for example and 1 minute later AKA 01:01 hrs it will say 27:45 for example 
and guess what that means? 
HTH 
That will be why it didn’t change over just after midnight then!
I checked it at the start of my shift last night and it had changed