Thermostat Radiator Valve broken?!

[Maccy]

Hi guys,

After the in laws stayed over Christmas, the radiator valve has mysteriously snapped off!

Is there an easy fix for this or do I have to get the whole thing off and replace it? I've tried to push/screw it back but no luck.

Got a photo for reference -

Spoiler

 

[Maccy]

That replacement head might work, and yes I can unscrew the metal ring.

Edit - even better, just found one I had in the shed which I bought earlier this year but didn't need, fit like a dream and all sorted! One man job to tick off the list