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http://www.plumbcenter.co.uk/en/plumbing/traps-pan-connectors/mcalpine-wm11-p-trap-applicance-nozzle-1-5-10495 Plumb Center normally keep them in stock.

Your problem is the float valve.

... Depends who uses it and how much they "strain" I always put screws in to secure the pan.

I recommend Vaillant. However, they are slighty more expensive.. but you get what you pay for.

Replace the float valve. http://www.screwfix.com/p/fluidmaster-bottom-entry-fill-valve-uk/84007?cm_mmc=Google-_-Datafeed-_-Heating%20and%20Plumbing-_-Fluidmaster%20Bottom%20Entry%20Fill%20Valve%20UK%20%22&gclid=CNW-3fmtnq8CFYwMtAodcHDUbg

Central heating CAN be used in plastic if you wish to do it that way. To be honest it doesn't matter if you use copper or plastic it's not going to make a difference to the flow. 22mm pipework is always advisable to hot water outlets on an vented system. With regard to central heating...

Turn off the incoming mains cold water tap. Open ALL the taps in the house. Wait for the water to stop running from every tap. Cut Pipes. Alter Pipes. Turn water back on.

All new builds have plastic pipes in the wall and get plastered over. I don't personally like it - but no reason why it can't be done.

I think he has pushed some sludge into the pump while powerflushing. As this is where he should of been powerflushing from - not from 2 15mm pipes :x If you unscrew the cap on the pump and help it start moving with a flat screwdriver it should get it working.

Could be a faulty gas valve. Might be the air pressure switch. Does the boiler try and fire (listen for a few "igniting" clicks) but then stops and gives up trying to ignite?

It's customers like the OP that make doing work in this trade a nightmare. I wish people would use common sense.

Maybe there is a hidden check valve on an existing pipe under the floor?

I believe that push button screws off anti-clockwise? It's a sign that your syphon is on it's way out.

No, you will only drain done the system as low as you are cutting the pipework. There will still be water in the system (i.e. other downstairs radiators). Correct. Commissioning is to ensure every radiator gets hot and the system is balanced. Yes you can.

Fit one of these - http://www.plumbcenter.co.uk/en/heating/flues-accessories/tower-flue-22mm-airsep-air-separator-81052

No you'll be able to get a new syphon to fit - but it will need to be ordered. I use this site - http://www.shop.lunns.net/syphons--flush-pipes-19-c.asp Measure your old syphon and look for something similar.

You do not need to remove the cistern of the wall to replace these syphons. It's a low level toilet. He didn't replace it because it's not a standard syphon and he would need to order one to fit into your current cistern. A universal syphon will not fit.

Sounds like an airlock. Have you bled the pump (by unscrewing the little cap in the middle off till it dribbles out water). Have you got any air peps in your airing cupboard?

The expansion vessel is your problem.

You're best option is to convert it to a pressurised sealed system.