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Radiators aren't big enough.

Best way is to have a sealed system installed (about £50 for the kit) A vented system with header tank has no place in a modern heating system.

The best way is take the radiators off! and flush out with a garden hose. Job done. You can also flush the system through with the mains which works pretty well. I would give BG the push. For the cost of british gas power flush I can put a whole set of new radiators in the house. :-)

Better to remove the lot and put some plastic in.

Put a 2 pipe system in. Shouldn't take too long. Half the piping is there. :D

Sounds like either the pump isn't pumping much or the system is blocked up. Switch it back to 3.

Gas meter should have an earth bond before the first branch in the house piping and close to the meter. See lots that dont have any earthing on. But if you bond the gas and central heating pipes and water pipes together (assuming all copper). Usually ideally under the boiler if you have a...

No sounds like a good old short. Cable letting electric straight into the piping. Little bits of solder here or there are not going to lead to the amount of gas you describe. It needs a steady small current.

More likely an electrical problem in the house. Could be the central heating pump as well.

Yes hydrogen burns with an invisible flame.

No you light the air coming out of the central heating pipework/radiator.

No the fix is easy. Sealed system kit. Remove header tank. Job sorted. There is the possibility you have an electric problem causing the generation of hydrogen. Try setting light to the "air" coming out of the system. Otherwise sealed system kit. Contains expansion vessel, pressure...

A sealed system doesn't have a header tank.

Go to a sealed system. A vented system has no place in modern residential heating system. Problem sorted.

Well if you have fuel there is no spark occuring. Remove burn out form the hole and have a look when it is trying to fire. All the burner needs is fuel and a spark. So if there is fuel there is no spark. Easy to see this with the burner out (it won't bite. Unless you stand in front)

Invariably it is fuel problems of some sort with it being wall mounted. Things to check/replace. Non return valve (consider fitting a tiger loop). Air leaks in the oil line. Pump pressure. Remove the burner and test fire. Is there any fuel being sprayed? If non fuel take oil hose from...

If you let your megaflow go cold. The switch the hot water on. There is an pressue relief pipe that should be near the megaflow that probably goes out through the wall. Check this for it dripping as the hot tank heats up. The megaflow as I remember uses an air bubble at the top of the tank...

Yes that is why installed cabled thermostats. It is foolproof.

It is wired wrong. Rip it out get a picture of the 3 port wiring diagram and redo it.

Hive. "While you control your heating at home!" NOT! The more complicated you make it the more there is to go wrong. Simple timer under 5 quid from local supermarket.