Possible Clues:

• Revolutionary piece in exam
• Perhaps the M 25 section that gets spoken about
• Godfathers of UK techno who recently said farewell
• Like planetary paths
• Taken all round, it's a bit in speech
• Part in speech, in a roundabout way
• Describing the M25 motorway?
• Gold piece, a pound that's circulating
• Boring part in exam that's revolutionary
• "Snivilisation" Brits