Click Here To Visit The SRGC Main Site
One more thing do the ground prep now and plant late autumn early winter.
I recommend Multi-Season Shrubs and Trees by Richard Gorer,published in 1971 by Faber and Faber.
Interesting that you mention Corylus - as I had wondered if coppicing would be an option.It would give a lot of flexibility as to pattern and depth of shade, and could easily be used in a smaller space.