The neon in your pic is on when the switch is off , if that goes out when you seperate the wires on the lighting circuit , than that is where the problem is, if your programmer doesnt come back on you have damaged it, that neon light should not be on when the switch is in the off position
Wires isolated with light down, but the red light remains lit on the hot water heater switch when off and still no display on either the Danfoss or thermostat fitted to the cylinder.
With the pic of your wires at the ceiling rose you cant get that wrong they can go either way round wont make any difference, some lighting rose have many wires going in but yours is a simple spur , so that hasnt caused the problem you are having, can you post a pic of your consumer unit/fuse box so we can see what your setup is
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