Possible Clues:

• (Eg, railway) system
• System of broadcasting stations
• Chain of television stations
• Tyneside couple, monarchs of the system
• New member of the RAF guarding a couple of interlinked units
• Perhaps like catching butterflies for an organisation
• ABC, for one
• System that resembles a mass of criss-crossing lines
• Complex rail system
• Rising war of words in Kent confusing system