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if its been installed by a professional then there should be an info plate attached to the gas meter.

hum and really really hot usually means pump is stuck. try whacking it with a hammer on the pump body when a demand is put on it. might be new pump time

Alpha? New boiler time.

Looking at those pics, the tundish is marked. Probably due to discharging. I think expansion vessel for the unvented cylinder is full of water. It needs pumping out and pressurising correctly.

Has the expansion vessel been left at the pressure set in the factory? Usually about 3bar. Needs setting to suit installation. Normally about .75bar. I would personally drain the system, deflate the ev, refill the system slowly using the bleed on the ev arm as it looks like the highest point...

From what I can see the pump looks like it is on the flow from the boiler and the magnaclean is on the return. I may be wrong. I would therefore also assume that an auto air vent would be installed on the return pipe from the boiler or there is one inside the boiler. If I'm right, I think when...

10 second Google will tell you. You're welcome.

Kitchen tap cartridge. Use a screwdriver as a stethoscope. Noise will be louder at the kitchen tap if I am correct.

Get the pressure checked and flow rate. Might need to install a pressure reducing valve and a shock arrestor.

Intergas or separate the system and new boiler using a plate heat exchanger.

I suppose saving a few quid is worth more than your kid's lives if anything were to go wrong........ probably won't get your house re built on the insurance either. Just saying.

Installed in 2011. Ever had it serviced?

£800? Size of house and amount of rads? Get 3 quotes. Consider getting a filter fitted

Land registry will tell you who owns the property. Will cost you £13 ish Or try a Google for rental property, it may give you letting agent details. Contact them and ask the landlord to deal with it Problem is, tenants may get arsey and act worse. Environmental health might be interested but...

Nothing unusual about that part leaking, quite common. Usually because the boiler has been installed without a shock arrestor. Relatively easy job. Might be a good idea to do the right hand block too, with a new flow adaptor and silencers. Not as cheap or as easy, and fit a shock arrestor too.

Google primatic cylinder. Evident by lack of separate f&e tank for central heating. Ie one big tank feeding cylinder only.

You never mentioned the salus controller or stat you have fitted. A please or thank you appears to be missing from your posts too. No wonder I don't venture in here often.........

All of the showers will have nrv's built in. If they are bar showers it's easy to find which are passing. Run the shower on fully hot, feel the left inlet pipe (usually hot feed) it will get hot. Turn shower off. If the nrv is faulty it will go cold pretty quick. Repeat with all of them.

It could be tmv's installed have a non return valve stuck open, causing cold mains water to push through into the hot supply back to the calorifiers. Won't be noticeable during the day with everything being used. Only when demand stops. Had similar in a pathology lab where storage tank would...

ring a boiler man, filling loop connected and passing or plate heat exchanger has failed. probably needs a new prv now as well.