Shall you get a new tube and starter?
he would maybe better off with a new light fitting as the emi will be most likely from the ballast, and not the tube ect,
better still replace the strip light with a different type of light fixing , If that is what only one can do, imagine what 20 of them would do , i know all too well, and the lights were not in my home, but a neighbouring property, the joys of the twisted pair copper ug cable bundles Especially if whatever is causing the emi is in close proximity to an internal extension , or the NTE is sited next to the electricity meter and incoming mains cable