A TRTO may only train licence holders, so it cannot train for a PPL. The original concept of a TRTO was to train for MP Type Ratings.
Type ratings for SPH can be conducted at a FTO however for some reason they became TRTOs meaning that they also have to be a Registered Facility if they want to train PPL students.
JAR-FCL 1.125 and 2.125 An applicant for a PPL shall complete at a FTO or an accepted Registered Facility the requirements in accordance with...
Perhaps the daftest thing is that a Registered Facility can train a PPL(H) on a R44, or a R22 but it has to be a TRTO to convert the pilot to the other Type once they are qualified!