I would agree from the tree shape and the leaves that its an ash - a similar leafed tree is the Mountain Ash (or Rowan). The Mountain Ash is very similar when young but its generally finer in shape and the leaves are more serated around the edge. Here is a good site for recognition of native trees:

http://www.woodland-trust.org.uk/bri...guide/home.htm

Click on Ash and Rowan to compare the two.