I'd hazard a guess at a Spiraea - possibly S. nipponica. There's one called 'Snowmound'.

I agree.... almost certainly Spiraea Snowmound

Thanks Spritz and Anchorman, will it grow much more? I ask that because I wonder if it's in the right place.

No, it's a dwarf shrub. :-)

I think it will grow to about a metre but if you prune it to the required size imediately after flowering it won't grow more than about 30cm per annum.

Thanks everyone, it's great to know not only the name of plants/shrubs but also the expected height - and usually I don't know either!

I've got this, and I call it 'dwarf' as compared with other Spiraeas. ;-)

Are other Spiraeas similar Spritz, in appearance that is, and what height might others achieve? I love this one so would like to try others.

Most spireas have pink flowers and grow to 3-5 feet.

The best is "shirobana " which has white ,pink and red flowers.

http://tinyurl.com/5vo84ms

another pink one is "anthony waterer"

http://tinyurl.com/64yhnjk

and "little princess"

http://tinyurl.com/6x37j6h

For a golden leaved variety choose "gold flame"

http://tinyurl.com/5sdvm8f

or "gold mound"

http://tinyurl.com/6zdqrp7

there is another white one, imo, even more beautiful than snowmound called "bridal wreath"

http://www.flickr.com/photos/31559373@N00/5603708581/in/photostream

I have Spiraea arguta, which has white flowers and arching branches - that flowers in April, about 4' tall, and S. vanhoutteii 'Pink Ice' which is also a dwarf, and that's a bit like yours, except that the leaves are a pretty mixture of pink, cream and green. Otherwise, I do have some of the ones Anchorman has mentioned. I cut them hard back and that keeps them to around 3'.

Thank you for the information on types of Spiraea that I might try. Went to Spain for a few days on 4th May, hence the late reply. Very glad to be back to my garden I have to say.

Of course you are! Hope you had a good break. :-)