As you are [presumably] not the RK, the 14 day rule does not apply to the NIP addressed to you. There is no time limit for issuing the s. 172 requirement to name the driver, other than that any prosecution for the speeding offence would need to be instigated within 6 months of the date of offence.
Depending on who the RK is (many company vehicles are leased, and a finance company is actually the RK) or how long the chain is, and how long the various links took to respond, the timing of your notice could be perfectly normal, or it could be the result of shenanigans.
Ignoring that your NIP is not the one required by law, the required details in the NIP (which do not include the colour of the vehicle) are "merely directory" - which means that if an error has no bearing on your ability to identify and recall the incident in question, it does not invalidate the NIP.
How wrong is the spelling of your name. Received wisdom suggests that if it is clearly intended for you, that is close enough.
As you are presumably not the person keeping the vehicle, your obligation in respect of the notice is to provide any information that is in your power to give and that might lead to the identification of the driver.
