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You need a land area around your house that is larger than most people's houses have, to use a ground source heat pump

No, just in my own house, where I have replaced most of the radiators. Prorads are generally cheaper than Stelrads, especially if bought online, and I guess that's because they're made in Turkey, not Britain. There seems to be nothing to choose between then on quality, though of course I haven't...

I guess you'll have to hope that leaks don't occur in inaccessible parts of the heating circuit - like under floorboards etc. What do you want to achieve by getting rid of the F&E tank and going over to mains pressure in your CH circuit even if governed? I'm a great believer in "if it ain't...

If you're putting in a combi boiler I think this will mean that there's no F&E tank and instead the radiator circuit will be under mains water pressure. If so, be prepared for some leaks!

As I said in my previous post, Prorad and Stelrad radiators differ only in their top and side trim panel attachment arrangements. Stelrad arrangements are arguably more complicated and the Prorad ones simpler and neater

Prorad and Stelrad radiators are pretty much identical, except for some differences in the way the top and end trim panels attach. I haven't come across Henrad radiators but wouldn't be surprised if they are much the same. What do you want to match up?

If you can find one the right size, you might find that just replacing the O-ring will stop the leak.

I've always thought the the description "cistern" was restricted to the tank providing toilet flushing. Any other tank with a float valve in it is a "cold water storage tank" or a "feed and expansion tank". This seems to me to a be a useful distinction but, hey-ho, if the purists insist they are...

Modern 6 litre cisterns are pretty much incapable of providing the old-fashioned powerful flush provided by older 12 litre cisterns. Most people have to flush multiple times to properly clear solid matter in the pan, thus defeating the aim of mandating 6 litre cisterns, which was to save water.

If you can switch CH and HW on separately, and only one boiler, you must have a least one 3-way motorised valve, or maybe two 2-way valves. Otherwise as soon as either the HW or the CH pump is turned on, HW will be forced around BOTH the HW and CH circuits

Your pictures don't seem to show any sort of float valve in the tank. If it's continually passing water, the easiest action is just to replace the entire valve

If it's bottom fed I think you may have trouble finding a ballcock type valve of this sort.

This inlet valve has its water feed at the bottom of the cistern. Most ball cock type valves have their water feed at the side. You need to check your ballcock valve to see which type of feed it has.

I would use a pipe freezing kit on the pipe below the valve. That will give you about 30 minutes to change the valve with no need to drain the system and no chance of soaking the floor.

Even if you could fit a syphon into a modern 6 litre cistern, I don't think they'd be enough water in the cistern to reliably start the syphon. That's why the move to small 6 litre cisterns forced the abandonment of syphons and the introduction of leaky bottom flush valves. The forced move to 6...

Yes, syphon flushes became unsuitable when the Govt mandated very small (6 litre) cisterns to "save water". So we got flush systems with bottom valves that, unlike syphons, can, and do, leak. What's more, the leak often goes undetected because it goes into the toilet pan. The small cisterns also...

May be best to replace both side by side radiators. If one has pinholed so soon then the other one may fail as well.

The toilet shown does not have a syphon flush system - it has the more modern bottom flush valve that is opened when you press the button. So don't buy a new syphon - it won't fit!

Running a washing machine when you're not in the house is even madder than altering a thermostat setting when you're not there. Washing machines can, and do, spring leaks and flood the kitchen and then the house if you're not there to turn off the water.

I've never understood why people want to control their heating themostats from a smartphone. Sure you can do it when you're away from the house, but why would you want to do that? When you're in the house, it's hardly a big trouble to walk over to wherever the thermostat is located to alter it.