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from left to right, the Honeywell t6360 is wired as follows
2= neutral (blue)
3= 2 x black wires which look as if they come from the 4073 hot water/
5 = live (brown) which looks as if it comes from a timer control panel
The Honeywell cm907 has 3 possible wiring connections
one says neutral, one says live the third is blocked but looks as if it is designed to have a link to the live connection. The cm907 is battery powered and apparently doesn't need an electrical supply.