Its not garlic and I do recognise it but cant bring a name to mind. do you know what its leaves are like?
reminds me a bit of butterbur but this is white and they are usually an Elastoplast pink..

Almost like a white ragged robin or maybe dianthus or sweet william. Pretty flowers but hard to tell without leaves.

have a look at White Butterbur [Petasites albus]

He saw it at the side of the road in Wales. He said it looks like White Butterbur. Thanks!

the leaves come through slightly later.

I would like to see the leaves as well. The flowers look like those of White Snakeroot, but that's not in season now.