Common Hazel, corylus avellana.
Dug out in april 2014, this stump is developing in training pot.
Just an update.
Broad canopy with slightly waving dropping branchlets over the edges of the slab, and low apexes is what I am aiming for. The white line represents the slab. I had to draw this within the contours of the pictures offcourse but in reality it will have to be a bit bigger, but with similar shape.