Radiator Valve Lip Snapped Off!!!!

[PlumbFun]

I was removing my radiator i went to turnt off one of the valves using grips to turn the lip on the valve and it snapped off i had to do this as there was no decorators caps on it.i do not know how i can turn this off now as it needs to be removed so i can get the room plastered please help

[nickso]

if you cant turn it off it probably means a new valve.

[chr15]

Which means a system drain down or vacumn the vent and cold feed pipes in the f/e cistern.