PhD Thesis Practice Based or Practice Led?

One of my concerns since starting my PhD is to understand how a Practice Based PhD differs from other PhD's particularly a Practice Led PhD and what format should my thesis take.  My thesis is split 60:40 between writing and practice. I shall expand on my findings in other posts but this Thesis by Erik W. Borg raises some interesting issues which I will expand on in future posts.

Update 5.10.14

I found an interesting series of papers from a conference hosted by University of Hertfordshire -  Research into Practice conference 2000 - in 5 volumes, follow this link. Volume 1  - The foundations of practice based research.

• Edward Bird – Research in art and design: the first decade 
• Neil Brown – The representation of practice 
• Fiona Candlin – A proper anxiety? Practice-based PhDs and academic unease
• Anne Douglas, Karen Scopa and Carole Gray – Research through practice: positioning the practitioner as researcher
• David Durling – Reliable knowledge in design
• Jill Franz – An interpretative framework for practice-based research in architectural design
• Sophia Lycouris – The documentation of practice: framing trace
• Katie MacLeod – The functions of the written text in practice-based PhD submissions
• Steffano Maffei and Francesco Zurlo – Designing as a competence: design process as the result of a 'learning by interacting' practice. Evidence from Italy
• Tim Marshall and Sid Newton – Scholarly design as a paradigm for practice-based research
• Jules Moloney – Studio based research in architecture: the legacy and new horizons offered by digital technology
• Terence Rosenberg – 'The reservoir': towards a poetic model of research in design
• Jane Webb - Research in perspective: the practice of theory