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Set every radiators lock shield to the mid position and open all their TRV's. Give them 15 minutes ,then tell us which have heated and which have not . Do you have a hot water cylinder that is heated by the boiler ?

Then the rad must start to heat now ?

Set the lock shield to it's mid position ( half way between fully clockwise and anticlockwise) see if that rad now heats up.

You don't need either PTFE tape or jointing compound on a compression fittings olive. Having said that, using compound wouldn't do any harm.

Not certain ,but pretty sure they can separate and O ring seal makes watertight joint between them.

How many turns of PTFE are you wrapping around the threads,you may need more.

It is the 2 blue lever handles ,turn both 1/4 turn until desired pressure is reached,then turn both back to original positions. Does not matter which is first or last .

Pictures of the pipework and valves below the boiler would be useful

Tectite classic Edit..as above

If you close both radiator valves the radiator can be drained by loosening the joint/s where the valve connects to the radiator. A receptacle will be needed to contain the water. As others have advised ,the drain cock below the TRV will drain the system ,and not what you want.

I suspect either way will work,although I tape first.

PTFE tape and a smear of LSX if you have any.

The blue one isolates the cold water flow into the boiler ( for domestic hot water),the other isolates the boiler from central heating system. As both heating and domestic hot water are both functioning as they should those 2 valves are open.

Either your mains cold water pressure is no greater than the gauge shows ,or one of the filling loop valves isn't opening

They are now both in open position. What's the boiler pressure at ? It's possible that the handle is not turning the shaft below on one of them.

You are correct ,the blue and black handles are used to top up pressure. They are both in closed position in your pic . Open both and tell us what the pressure gauge reads . If pressure doesn't increase one of the valves isn't working, (remains closed).

Did that take 6 years to arrive !!! The TRV would be set to fully open on all rads when balancing the system. The lock shield valve is used to balance the system. It doesn't really matter if TRV is on the flow or return pipework as it's almost certain to be bidirectional. Check the body of the...

Other than fitting a coupler to convert 1/2 to 3/4 male ,(which would very likely result in the new shower valve sitting too far away from the wall for the chrome shrouds to cover the fitting and reach the wall), you should try to find shower valves that need 1/2 feeds. What is the distance...

Ok, not 3/4 then . Any access behind the wall to alter pipework?

The picture may be deceiving ,but the threads look more like 3/4 BSP ,and not 1/2 inch. What is their outer diameter ?