Posted: 28/01/2015 at 09:34
Tibetan Cherry Trees give a wonderful reddish bark, cherry flowers in spring and summer and autumn foliage.
Katsura tree - grows slowly, difference looking foliage, golden leaves in autumn and will not damage the tarmac.
A Weeping Blue Atlas Cedar. Just fantastic and slow growing.
Birch and Rowan get too big too quickly. The Maple will not appreciate its shallow roots being underneath tarmac. So I suggest removing as much tarmac as possible.