Which of the three aircraft can you fly and in what capacity?
Firstly, you can fly in any of the three with a qualified flight instructor who is on the panel of instructors for the Club. The flight can be logged as Pilot under tuition or P.u/t on any of the three. On the first aircraft, the training record will be for the National ICAO PPL(A). On the second aircraft, it can be counted towards the National ICAO PPL(A) or the EASA Part FCL PPL or LAPL. On the third aircraft it can only be counted towards the EASA Part FCL PPL(A).
Secondly, you can fly solo under the supervision of a qualified flight instructor (instructor on the ground while you fly as sole occupant), in the second and third aircraft but not the first unless you hold a Student pilot licence.
Then there are the rules for operating the three aircraft.
Thankfully the rules of the air are now common across Europe and you must comply with EU.923 - 2012 Standard European Rules of the Air (SERA). However the Operational rules depend on which of the three aircraft you chose to fly. The first aircraft must be operated with regard to the National Operations Order. Statutory Instrument (SI) 61 of 2006 Operations Order. The second aircraft depends on its use. If training for the National licence than the National Operations order applies. If being used for EASA licence training then EASA rules apply. EU 965 - 2012 Annex IV Non commercial Operations (NCO). The third aircraft being an EASA aircraft, must be operated in accordance with the latter (EU 965).
The training syllabus (for three near identical aircraft) varies depending on the licence being sought. The National PPL and EASA PPL require 45 hours training while the EASA LAPL requires 30 hours. The first aircraft will require an artificial horizon, Direction indicator and Turn indicator along with Radio, Transponder and Navigation equipment (VOR, DME, ADF, GPS). The other two do not necessarily have to be as well equipped even though they both hold a Certificate of Airworthiness vs the Flight permit of the first aircraft.
The bottom line is that the Regulators both National and European (EASA) have created a monster.