tricky rad valve tail removal?

[that bloke.]

seems one of the valve tails has snapped off , its a brass 3/4 tail.
what do you guys think? i was going to try and unscrew the whole bush and put in a new one but that sounds like a bit of a mission trying to unscrew that.

 

[migoplumber]

easy way is to retap rad.
correct way is to replace existing, apply lots of heat and remove with your 24" !!

 

[wnjswozo]

take out bush,you,ll free it with sharp bang with lump hammer and cold chisell,on egde of bush