This tree is a volunteer and I am hoping to find out what kind of tree it is.
Below is a more recent photo showing flowering.
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It looks like a Laburnum. Probably a Common Laburnum Laburnum anagyroides, also known as a Golden Chain Tree. It is from central and southern Europe.
The seeds are poisonous.
Here is a photo of the leaves From http://www.saps.org.uk/trees/laburnum.htm