Well it might be Cornus alternifolia or one of the Spiraeas such as arguta, but not close enough to tell, really - need to see close up of flower/leaves, as well as this pic from a distance.

Hi, I think it could be Exochorda x macrantha 'the bride' by the layered appearance, Derek.

Also looks like Viburnum plicatum f. tomentosum 'Mariesii'.

Thank you all for your help with identification of this shrub.

I have looked up all your ideas and have found out that it is definitely Viburnum plicatum.

I should have taken a close up photo for you as well as this one.

Much appreciated.

Beautiful shrub, love mine