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That depends on what the competent person finds out tomorrow. 230/240 volts present at the isolators supply terminals ,and not at its load terminals would mean the switch is duff. If no mains voltage is reaching the switch then the supply needs to be investigated.

Have you measured the voltages at the isolator,supply side and also the load side ?

How did you measure voltage with the mains power off ???

Exactly which model shower do you have ,and where are you taking the voltage readings ,at the shower or , it's isolator ?

The pipe in the left corner ,which has bright copper section, just below the wooden shelf , is the feed to the cylinder. See if there is an isolation valve above the shelf.

Is the terminal block held in place with a metal tab into the earth terminal ? If so that earths the fitting.

Start checking at the light fitting that's working (living room),the feed to the other lights originates there.

As cisterns now only need to hold enough water to flush 6 litres ,they are inclined to be a lot smaller than they were. Changing your cistern will not solve your problem. If your flush valve isn't flushing 6 litres there is something amiss with it. The volume of water they flush can be adjusted...

Pictures of the hot water cylinder that has the immersion heater in it ,and the pipework around it would be useful. As well as pics of the taps of course.

If you want to isolate the hot water supply to all taps ,that can usually be done at the hot water cylinder,is that fed from a loft tank ?

I suspect a flat bladed screwdriver of the right width blade ,hammered into what's left in the tap would allow you to turn the valve off. What area of the country are you in ?

Are the 2 motorised valves the same make/ model ? If so swap them over , so the one for heating is now connected to the hot water and vice versa. Tell us the result.

If you separate the cistern from the pan by removing the bolts / nuts that hold them together ,you should be able to tilt the cistern away from the wall to clear the remains of the screws in the wall.

The OP has already tried swapping the valves,see post #6 Harry. Sounds like a wiring issue or dodgy stat.

Did the system work ok previously ,and your current problem is a recent occurrence?

A slight difference in height isn't great ,but unlikely to cause much grief

Correct.

Is the " blocker / diverter" nearer to one side / inlet port. If so ,that port has to have the flow connected to it.

The baffle is just a physical diverter to direct the incoming flow upward. If you want to establish which pipe is the flow, connect a piece of pipe between the valves and run heating, whichever pipe heats first is the flow.

Is the rad fitted upside down ? Can you see a baffle, looking through the inlet port of whichever side of the rad that should be connected to the flow ? If you close off every other radiator by it's TRV ,EXCEPT the smallest one on the system ,does problem rad heat up ?