If you do get a Notice of Intended Prosecution (NIP) you will also receive a "Request for Driver's Details". This is a different document (though often printed on the same piece of paper as the NIP) subject to different rules. You must complete this within the 28 days allowed, naming yourself as the driver. Failure to do so will see you commit a separate offence which, on conviction, carries a hefty fine, six points and an insurance crippling endorsement code (MS90) which will see your premiums rocket for up to five years.