Fill, Bleed, and Remove a radiator

How to fill, bleed or vent air from a central heating radiator, also showing how to remove the radiator in future for decorating, painting, tiling, plastering cleaning or flushing out the radiator.
This method saves your valuable inhibitors, water, time & potential messing up your floorcoverings.
WARNING; removing radiators the traditional way,ie to try to drain them off individually, gives rise to potentially staining your floorcoverings which you cannot often remove.