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Now I'm trying to refill the system, there are 22 radiators and I am trying to fill them one by one starting with the lowest (as the book says), but each time I open a bleed valve a little air comes out of that radiator and then it stops filling - if I go to another radiator the same thing...

When I open the drain plug (supposedly the lowest point in the system) only a little drip of brown water is coming out, but when I undo the actual radiator valve that I'm trying to replace, loads clean water gushes out! The header tank is empty and stop-cock closed, so no fresh water can be...

I drained down my CH system overnight to replace a leaking radiator valve. I thought i could leave the hot water system running, but I noticed the pump making a strange noise this morning and I guess i've messed up! I've turned the boiler and pump off now, but my question is am i likely to have...