Pearl Bush.

Exochorda The Bride - Pearl Bush is a medium sized, dense, deciduous shrub with arching branches of mid-green leaves. Produces white flowers in short racemes in early summer. Plant in full sun or part shade. 

Eventual height up to 2 metres  with a spread of up to 3 metres

This is a deciduous shrub so it will lose all its leaves in autumn shooting fresh new growth in the spring