Then you should respond to the SJPN by pleading not guilty to both charges. In the ”mitigation” section you should offer to plead guilty to speeding but only on the condition that the FtP charge is dropped. This is a procedure well known to all court users (prosecutors, magistrates and their legal advisors) and is carried out up and down the land daily. I’ll refer to it as “the deal”.
Before the pandemic it was necessary to attend court to undertake this deal and speak to the prosecutor (the agreement of the prosecutor is required as the court cannot accept it without that agreement). However, during the pandemic most courts accepted a written request to do the deal. Local police prosecutors made an agreement with their courts that the magistrates’ legal advisors could accept the deal. In some areas this arrangement has carried on.
This will still see you with a speeding conviction but will avoid the much more damaging conviction for Failing to Provide Driver's details.