I am an engineer by professionk. my work experience is contracts related. I have been accepted for Post graduate Diploma in Law in University of London, I wanted to learn more about the university online program, it's faculty credentials and training, peer reputation, and whether I will be eligible to work as a lawyer in Middle East.

Also I wanted to know the difference between GDL and PGDL? And LLM for non lawyers.

In terms of whether you'll be able to work as a lawyer in the Middle East, it will depend on the rules of the country you want to work in. There is most likely some kind of licensing procedure.