Are you the registered keeper?
Is this the first NIP?
I presume the first was to the leasing company?
In that case they are in time.
They only have to send a NIP out within 14 days to the registered keeper. When it reaches the actual driver is a non issue as long as the matter is summonsed within 6 months.
They will have sent it out to the leasing company who will have identified you. That must have been in time looking at the dates.
I'm very sorry but that is the reality I'm afraid.
Can I clarify anything for you?