Back in the 1970s the Beeb replaced its reliable old RBM colour monitors with Pye ones (see picture of CMCR9 containing same)

     

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and many mods were carried out to try and improve their reliability as more and more were installed in TVC.

Eventually an urgent mod came round to stop them radiating at 150MHz – TVC by now having become a hot-spot for this (but no-one in the building had realised it).  Someone reckoned that a radio ham on the White City Estate had complained because the 144MHz Amateur Band had been wiped out in the Shepherds Bush area.

One of the big screen versions of this telly (an audience monitor maybe?) is preserved for posterity in "The Three Doctors", featuring William Hartnell on it.

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Apologies for not recording who posted this.