They don't indicate how many travel documents should be sent, but they made provision in the letter to accommodate everyone in the application.
So, the main applicant should fill his details on the section provided for applicant, while all dependants should fill their details on the space for dependants.
▪ That is to say, you only need one printout of the PPR letter & fill in the details based on your position.
In your case, main applicant on Applicant, dependant(s) on Dependant(s). Leave other unused dependent boxes blank.
▪ Consent form should also be just a printout.
▪ Passports & 2 passport photographs each should be for everyone included in the application, that is the main applicant & all the dependants.
Very important: Remember to follow very closely all instructions regarding the passport photographs.