Didn't need to see a scan of the SJPN - just needed to know whether you had been charged with both offences or just the speeding. And whether you were the driver (or at least most likely the driver).
For the sake of completeness, from the offence dates, a NIP would (or should) have been sent to your last known address on 03/06/2024, which would have been deemed served on 05/06/2024, and the offence of failing to provide the information would have been committed at the expiration of 28 days beginning with that date - so 01/07/2024.
If the police can prove that the notice was properly posted to your last known address (by first class post), it will be deemed to have been served 2 working days later, unless you can prove the contrary (on the balance of probabilities).
Logically, the following are the possibilities -
The notices were delivered to your current address and you are claiming not not have received them,
The notices were sent to your current address, but lost in the post,
Your current address is not your last known address (as in the address held by the DVLA for the keeper), or
The notices were sent to some other address for no good reason.
For the NIP, reminder and SJPN to get lost in the post with no (other) known postal issues seems somewhat of a stretch.
If the NIP had your correct address on it (or your last known address if different), I don't fancy your chances of persuading a bench that the NIP, reminder and SJPN all got lost in the post with no evidence of other postal issues.
If the NIP was sent to the wrong address, there is basically no case to answer.
The above mostly concerns the s. 172 charge. The speeding charge, in and of itself, has no legs. However, if it is not viable to defend the s. 172 charge, you should be able to "do a deal" to drop the s. 172 charge in return for pleading guilty to the speeding.