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There is a grub screw on the brass fitting to the plastic ball, you can undo this to make adjustments by sliding the ball up or down on the brass rod. Other than that you can (Very carefully) manually bend the brass rod. The higher the ball the higher the water level.

If it's leaking between the nut and spindle you can try and tighten the gland nut. Small spanner and fingertips mind you, It should only need a little nip!

You don't need a zone valve on any returns, Just on the flow of each zone you are wanting to control.

Yes, I use this method with back boxes behind the radiators. It does away with the legs that go through the floor. Much neater!

It could be water hammer. Is your pipe work clipped correctly? That sort of inlet valve should work on both high and low pressure.

The very few i've seen being installed are usually set to the height required and then concreted in.

Plasterboard bonding compound. Mix straight out of the bag with water to a consistency where it just holds on the trowel without falling off (not too sloppy) Sets like bell metal and never let me down! Used this method with resin trays onto a plywood base and timber frame.

As stated by waterworks you can measure the existing rad and find a new rad to obtain the BTU/KW otput of the old one. Things to bear in mind are, Is your old rad single or double? Does it have convector fins on the back or in between? Measure the hight and width of your existing rad and go and...

In my experience, The time it takes to clean up old copper for re-use and time wasted sorting through odd lengths and offcuts doesn't make it worth while. Also, I imagine you want your new bathroom to last for quite a while? Copper pipe is prone to pinhole leaks developing with age. Its...

If its a sealed system I.E a combi boiler you have. You could simply drop the pressure via a drain valve, Close the drain valve to seal the system again, Cut and cap the pipe and re-pressurise the system. The water will hold in a sealed system (a bit like holding a glass full of water upside...