Thanks all for your help & advice!
Was thinking of planting the bulk with Hawthorn, then diversifying the rest with beneficial insect/bird/Squirrel loving plants aswell as hoping to make the most out of fruit trees in the hedgerow. So two more questions;-
1. How many Hawthorn do you think I should plant roughly?
2.Once a Leylandii gets felled ( giving more light to the situ), do you think Naomi will be able to plant in Field Maple, in a westly posistion under a canopy of Ash Hazel, Lime & Oak?
Thanks In advance
Jez