In article ,
"Dave Plowman (News)" writes:

No. But you might have to replace the short pipe going into the rad,
depending on the design of the TRV - but it comes with the TRV, so is
simple to see if it's different.
You need the correct tool for this - an allen key that fits inside the
pipe. Not expensive.

I found a 1/2" cold chisel with a hexagonal shaft to get the spanner
on was just perfect.

--
Andrew Gabriel