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Do you lose pressure when the boiler is cold ( not been used for a few hours )and not in use at all for domestic hot water or central heating ?

No. Old switch L2 and L3 = L1 and L2 on the new.

L1 on your old switch= com on the new.

The short answer is Yes ,you can .

There would be a marginal increase,most type 2 double panel BTU is less than 6000.

Is the wall behind the cabinet plasterboard,or solid brick plastered over ? I would be inclined to chase out the wall and bring pipework in through the back of the cabinet.

No.

Removal is required,and take to a plumbers merchant to match ,there are many versions. Also, replace both hot and cold valves.

Yes. Allowing air into the system using the higher radiators bleed valves breaks the vacuum.

Correct ,it's the vacuum that holds the water from continually flowing.

You don't need to do anything regarding the cylinder or anything associated with it.

Don't touch any other radiator. Use the air bleed valve on the radiator in question to reduce pressure a little before draining that rad. Is the cylinder you refer to an unvented cylinder ?

You need to fit a new lock shield ,which is possible to do without fully draining the system. Close the other valve and drain the rad,after a while the water should cease to flow from the valve,and you can quickly swap the valve for a new one.

Is the system sealed/ pressurised ,or fed from an F&E cistern in the loft ?

A sudden drop in flow rate to a specific part of the premises plumbing is usually associated with something being altered,such as an isolation valve being partially closed,pipe being crushed,or a physical obstruction restricting pipework. Could any work have been carried out on your plumbing in...

Show us pictures of all components that came with the tap. As well as the tap ,side on.

Do you mean one bulb works in all positions ? If so connect the permanent live to the switched live at the switch position and see if all lights work. If they do the dimmer is the issue.

Replace the complete valve,body and actuator.

Sounds more like a cone fitting,rather than an olive that was used. Pics would be interesting .

You could check tomorrow how well the olive sits on the pipe by undoing the compression fitting,and try to knock it off the pipe . Rapping a spanner against the nut onto the olive. If it slides off the pipe easily it's a weak joint.