don't take any notice of the noddy.
cause you can cap the two feeds to the rad off.
heating systems are plumbed in parallel not series.
and don't effect the other rads at all they all come off the flow/return.
if plumbed noddys way when a trv shuts on one rad all the rest will go cold.
this is not the case. just cap them off
you have an open vented system.
hi-spec plumbing & heating (essex)
August 2010