If you do the graphs 0100 to 0100 GMT for wintertime and 0200 to 0200 BST for summertime, you can brush the change of clocks under the carpet and just label the x axis GMT or BST as appropriate. All the discontinuities will be between graphs rather than on any one of them.
The new system is going to completely re-draw them and planning some interactivity, etc so this will become less of an issue. The code we have doing this is very old and not great.
seb



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