I am not certain , but the foliage and flowers make me think it is a Mulberry , probably the Black one, Morus nigra. If it is it is a nice vigorous looking young specimen. However I would wait for further replies to be sure of what it is, as I certainly could be wrong on this.
Thanks for this. My worry is that I have inherited two of these in my garden in SW France and I am worried they may grow too big.