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With a wireless thermostat all you need to do is wire in a control box to the boiler, then the sender(thermostst) can go anywhere in the house, this is usually battery operated

Its a good idea to fit a room stat, I would fit an RF stat (wireless) this will keep disruption to almost zero, however I would recommend getting a good electrician or plumber with relevant quals (part p) to install if you have no knowledge of electrics, they are not difficult to install but...

Do you mean they are rusting on the outside? if this is where the valve enters the radiator then they could have been leaking for some time, this would lead to the rusting, you may be able repair by removing the valves and refitting with new PTFE tape, but it depends on the amount of corrosion...

It looks like an old soil pipe from an outside W.C.

I wouldnt count on it

I have been waiting for a diverter for one of these for a week, first Ideal said they used 3 different types so could i supply serial number, when i did this they then contacted me asking if it had a red or grey actuator, told them red, then they said that serial number didnt have red actuators...

I don't think he knows that, and he has said there is no isolation, I'm just trying to ascertain what type of cylinder he has so as to talk him through isolation :-)

What type of cylinder is it? do you have a tank in the attick or higher above the cylinder or is it attached to the top of the cylinder??

I think if the pipe T'd in to the flow (the one above the white box) leading to the pump is a smaller size then it is the cold feed, in which case it begs the question "Where is the vent"????, you need to follow the pipes into the lost and find out how and where they are arranged, then if poss...

Ok, you really need to get a good spark there, by taking the MCB out of the loop you now have NO overcurrent protection, if the MCB was tripping it was for a reason, either to protect the circuit or because it had a fault, I really really urge you to turn it off and get it proffesionaly checked...

Check continuity of the leads from PCB to fan.

Every hour, wow, well as I said a 12kw appliance could be pulling over 50 amp, As you have this type of heater am I right in assuming you live in a rural or semi-rural location?

Do you know the ampage and short circuit rating of the RCD, also is it just an RCD or an RCBO (Combined RCD and MCB)? because an RCD does no actually protect overcurrent situations.

You really need good quality connectors, remember 12kw on a typical 230 volt supply can pull over 50amps of current, most connectors found in diy or most retailers are 45 amp MAX. make sure all connections are rated at over 50 amps or you will always have trouble.

Is there any way you can post a pic of the pump and surrounding valve assembly??

It could well be a blockage as Mikyg said, it would most deffinatly be where the expanssion vessel is connected to the pipe leading to the system, drain the boiler crack open the nut on vessel and check there, usually blocked with crud, if its not then yes you may have a split diagphram in the...

Yes Mikyg is right, the Glowworm boasts being able to deliver around 170lts of hot water before switching to full combi (instant) mode, this is done due to its thermal store, so you should find that even on an excellent flow rate it will satisfy most peoples needs, however as already stated...

Could possibly be air trapped in the top of heat exchanger, check boiler is perfectly level, or possibly scale build up in the heat exchanger.

Could I ask why you are fitting an unvented, is it just to accomodate a solar system???

If you have tryed another controller and everything works ok, then it could well be a faulty one.