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Tie up the arm of the fill valve. If that stops water entering the system and water is still trickling into the bowl then it's the flush valve which is faulty.

Probably a useful feature in America, with its long straight sections of inter-state highway, so that the drivers can take a nap :giggle::giggle:. My car has it, but there's a switch 'conveniently' located just near a knee position, such that it can accidentally get enabled when the driver...

One of these?:giggle:

Is it accurately aligned?

Have you tried pushing a pin into the hole? It just might, perhaps, possibly, maybe release some catch to allow the handle to pull off.

How tiny is tiny? Can't see it at all in your pic.

Do you? Wayners used the word "maybe". Spreading the load (as you imply in post #3) is a possible reason too.

As Harry says. But failing that, it might be worth trying some suitably-sized round-section O rings.

If the underside of the shed is accessible, ~ 2mm thick plastic washers fixed with galvanised clout nails at 30cm or so spacing can be effective to create an air gap, so that even if the timber gets wet it can then dry out.

The gate looks a very tight fit between the posts. Have you allowed for any expansion of the timber when it gets wet?

Isn't there any loop/projection/whatever that you could grip with pliers or insert a coat-hanger-wire hook into?

Certainly looks like leylandii. As said, best removed. It's fairly shallow-rooted, fortunately.

Well your middle pic shows the water level right up to the overflow, so if the water's not draining out through that where has it been going?

If both floats are under water (as it seems in the pics), then the float valves are faulty and water will overflow somewhere when your stop-cock is turned on.

Can you post a recording of the sound? Might give someone here a clue.

Tie up the ball valve on the F&E tank in the loft temporarily, in case the valve is passing slightly and generating a vibration. Are there any drips from the overflow of that tank?

Sounds like a loose wire connection in the light fitting or switch. Isolate the lighting circuit, check it is isolated, get your screwdriver out and ensure all screws are tight in the fitting and switch..

Looks like an old gas appliance tap on that pipe stub.

Is the pump motor of that model designed for variable frequency use?

If you trace the pipe coming down from the loft tank to the cold tank, hopefully that will have a stop/service tap in it. If not, you could put a bung in the loft tank exit, or shut off the feed to the loft tank and drain it.