...Im a bit confused and would like to work out the most cost efficient solution to getting back in the air!
I know.
Even those of us who's job it is to keep up with these things are finding it difficult to understand the embarassing shambles that the UK/EASA Licensing System has become.
There are several ways you can go, but I think the cheapest and simplest way to achieve what you want is to get a Medical Declaration from your GP, do training/test in the Falke and apply for an NPPL(SLMG), on the basis of your expired PPL.
In the future, you can then add SSEA and/or Microlight class ratings if you need to fly non EASA conventional light aircraft or microlights, (Annex 2 aircraft) or upgrade to an EASA Light Aircraft Pilot Licence (LAPL) If you want to fly EASA light aircraft such as 2/4 seat Pipers and Cessnas
MJ