ID Of Strange Bulb.

Can anyone tell me what this strange white flowering plant is...I realise it must be a bulb of some sorts but we have never planted it and it started coming up a few years ago and the patch of it has got bigger each year....it doesn't have any scent but looks pretty and unusual...never seen anything like it before so would love to know what it is...please excuse the ground elder, the plot is our habitat pile and all sorts grow on there.

 

Have you tried picking a leaf and crushing it, then smelling?
Looks like Allium paradoxum.
Leaves will smell of onions.

http://www.ukwildflowers.com/Web_pages/allium_paradoxum_few_flowered_garlic.htm

http://www.google.co.uk/search?q=Al...JIb7PLvXgPAO&ved=0CAoQ_AUoAQ&biw=1097&bih=491

 

Thanks hun...will give the leaves a crush and see....looks exactly like it.
Could a bird have dropped a seed for it to be here?

 

Leaves crushed and smelt as advised and yep they really do smell of onions...thanks so much for your help x