And now I have student from 6 odd years ago, almost finished his PPL, but stopped.
Training conducted after Apr 2012 is acceptable; obviously all relevant records from the previous RF/DTO must be complete. All exams will need to be taken again, but apart from that training should simply continue from where it left off, with a bit of refresher training.
Why ever did you feel the need to contact the CAA? Your CFI / HoT should know this stuff!