Have I got this right , currently daylight saving time in France as in
UK but extra hour ahead of us.
So plot times 0200,0800,1400,2000 correspond to 0100,0700,1300,1900 BST
(0,6,12,1800 GMT)
Different start and end days of daylight saving , but in the depths of
winter.
If plot times are 0100,0700,1300,1900 they then still correspond to GMT
0000 0600,1200,1800