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Sounds like a reasonable plan ,are you using copper pipes ? How are pipes to all downstairs rads going to be routed ,surface mounted ?

If your not comfortable working with electrics then an electrician would be required.

Hi ,you don't repair the switch ,you replace it with a suitable new one. And check the condition of the cables , particularly the insulation and copper conductors.

After more than 2 years ,I expect SirGalahad has had it sorted !!

Your issue has nothing to do with any air pocket, and the BG engineer needs more training !!

Depending on where it leaks ,there will most likely be some type of seal that needs refitting or replacing.

Yes ,hence it's called a float valve ! Bottom of the cistern ,the pan is the bit you sit on.

Replace the float valve.

Is it the old TRV that is passing water when off ?

Not likely to be connected to radiators not heating fully ,but needs attention.

Good luck ,hope you get a favourable response. Keep us informed.

It's not uncommon on Megaflo cylinders ,exactly which models / what period of manufacture,and how many are affected isn't common knowledge.

Does water drip constantly,non stop, or does it eventually stop ? If it doesn't stop, replace the float valve .

I Suppose there is a limited chance that a complete blockage of pipework may occur ,but it's unlikely in my opinion. You could try contacting the manufacturer claiming it's a design fault and should be replaced free of charge.....

I have not read all the old posts , is the pump freely spinning and is it full of water ?

Unless someone has figured out a way to repair that I am unaware of , I am afraid a new cylinder would be required. That's not cheap, a few thousand pounds .

After 16 years it will not still be under warranty. You could contact B/gas to see what your cover extends to,but I doubt it will cover the cost of a new cylinder.

The part is the air separator by the way.

That is an unvented cylinder ,and a part inside it is breaking down and the residue is what is blocking your shower valve. How old is that cylinder ?

Your issue isn't limescale ,it's a problem with your unvented hot water cylinder. Show us a pic of your hot water cylinder.