looks like a 'bird cherry' to me but it could be any number of others.

Well it looks like Styrax japonica, but its a bit early, isn't it? Usually flowers early summer, but I suppose that very warm March might account for it...

Dunno, Pim. The leaves look almost like a walnut, but the flowers most definitely aren't.

The flowers grow in a very loose lilac type spray/ spike. Wish I had took a better picture!

Leaf and bark would have been useful, plus a picture from a distance showing growth habit.

Prunus cerasifera and Prunus spinosa are in flower around now though...

Think it's too early for a Styrax Japonica . . . only just in leaf in my garden. Fascinating dilemma :)

How about Prunus padus?

Prunus padus is bird cherry - but that doesn't flower till early May, and its flowers sort of stand up in spikes rather than spray out sideways.

Is it May Blossom?

Mmm...I will take some more pictures tomorrow. i just googled a few images of Prunus padus...some do look like this quite a bit.

My Prunus padus 'Bird Cherry' is in flower so is my neighbours and looks like the flower in your picture, mine has a reddish bark.

If its P. padus, it should be fragrant...

Ah...When I added it to my photo's I mentioned I have a Cold and no sense of smell :)

Got a bark picture of a huge specimen I will add in a minute ... P. padus for sure...Thanks all.