What time of year was it in flower? My book says "It`s a medium sized tree, usually 10-15m high but occasionally more with an open crown. A Chinese tree widely planted in southern Europe and less often north to southern England. Bark - smooth, grey
Leaves - Heart-shaped with a long, tapering point, 30-35cm long and downy on both sides. This gives them a dull green colour and combined with their tendency to hang limply from the branches lends the tree a somewhat weary appearance.
Flowers - large (5cm long) violet-blue with deep tubes and five spreading lobes. They appear in June
That`s the Foxglove Tree by the way.