Hi Hopeful
Suggest you follow this link:
University of Glasgow :: School of Engineering :: Our staff :: Dr Stewart S Houston
On Prof Stuart's page you will find his email. I would recommend you mail him with your queries and questions. He presently is professor of Aero at Glasgow University.
Stuart is one of the UK's most distinguished helicopter aerodynamicists and in earlier days worked on some of the UK's more exciting helicopter research programmes. I was privileged to work with him briefly.
I trust he will be as helpful as I anticipate
Best regards