Mike,

Only too pleased to help

I look forward to the outcome of your tribute and hope it strikes a chord with his family

It is good to see the interest in one of the numerous aircrew that paid the price

Just to answer your question on the Observer speciality have a look at the Wiki entry http://en.wikipedia.org/wiki/Air_observer

Or in the works of an Air Observer

http://www.aviationancestry.com/Recruitment/RafRecruit/RafRecruit-AircrewObserver-1941-2.html

http://www.aviationancestry.com/Recruitment/RafRecruit/RafRecruit-Observer-1941-15.html