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Thanks. I wonder if part of the problem is the position of the black CH plastic valve? It was in the middle of the two so I moved it to the left - is this right?

Sorry it's a Vaillant Ecotec and a Honeywell Programmer.

For the past few days when the hot water clicks on the Radiators click on as well. - I have the heating set to 'off' so I know it is not the thermostat. - If set the radiators to off on the boiler then the hot water doesn't come on!? I have a two port valve which from my reading will not...