I may be wrong but wasn't the CAA-PPL a forerunner to the NPPL(?)
No, the CAA PPL was the forerunner to the JAA PPL (and is still equivalent to it in UK registered aircraft).
....am i right in thinking that the LAPL will be valid in all member states, in Annex II and EASA aircraft....
Possibly - the LAPL will certainly be valid in all relevant EASA aircraft but its validity in Annex II aircraft will depend upon each state of registry. The UK CAA have indicated that it will be valid in UK registered Annex II aircraft.