Hi Jon,
From what I remember you need to log experience in a PART145 environment...you need to check if the company you're working for has that approval. If not, contact the CAA (Engineer Licensing) for clarification of your particular situation.
You don't need to do all Chapters - for whichever licence you're aiming for - but you do need to do at least 50% across all applicable chapters if you can.
Again, If you find 50% impossible contact the CAA.
Best of luck
Rigga