Remember its 14 working days.
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As LC0112G says, as per the .Gov website, legislation requires the powers that be to notify the Registered Keeper within 14 days, as in 14 consecutive days, regardless of weekends etc. 
Just to clarify, my alleged offence was on 11/05/2014 and my NIP is dated 04/06/2014, some 25 days later. It arrived through my letterbox on the 05/06/2014. Both dates are on the same letter so it's quite clear that there was never any intention for the notice to arrive within 14 days. A technicality maybe, but a law all the same.
I have lived at the same address for 31 years and I am the first and only Registered Keeper of the vehicle concerned so no confusion there.
LC0112G
Thanks for the advice. I'm going to construct a letter somewhere along the lines of one you have linked to. Just need to check that DVLA hold the correct details before I send it.
Got to be worth a shot I suppose. 
To be clear - You MUST repeat
MUST still fill in the S172 form they sent, including everything they ask for, nominate who you believe the driver was, sign it, and return it so they get it within 28 days. If you don't you are guilty of a S172 offence which is a quite separate offence to the speeding charge. The late service of the NIP will NOT be a defence to a S172 charge. Get proof of postage from the post office.
You don't need to check with DVLA. Just look at the front of your V5 for the car - you have got the V5 haven't you?. The name and address on it is the address DVLA hold.
So make sure you are watertight on the S172 front, and then contest the late NIP by sending off the AA/RAC letter. If what you've said is correct, then you have a cast iron defence.
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Topic: Anyone ever challenged the 14 day NIP time limit? (Read 15539 times)